Before resorting to sources from the internet (stranger danger!) I would suggest asking around your neighborhood as many teenagers are looking to make some money on the side and might be wiling to assist you. In the event that does not work for you, here are some websites to help you find a babysitter:
Care.com
Sittercity
UrbanSitter
SeekingSitters 
Nextdoor
Before resorting to sources from the internet (stranger danger!) I would suggest asking around your neighborhood as many teenagers are looking to make some money on the side and might be wiling to assist you. In the event that does not work for you, here are some websites to help you find a babysitter:
Care.com
Sittercity
UrbanSitter
SeekingSitters 
Nextdoor
user
I would also suggest posting on your neighborhood Facebook page or Nextdoor.

Good luck!

Edit: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 1: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 0: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 2: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 3: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 4: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 5: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 6: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 7: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 8: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 9: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 10: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 11: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 12: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 13: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 14: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 15: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 16: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 17: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 18: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 19: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 20: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 21: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 22: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 23: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 
assistant
Before resorting to sources from the internet (stranger danger!) I would suggest asking around your neighborhood as many teenagers are looking to make some money on the side and might be wiling to assist you. In the event that does not work for you, here are some websites to help you find a babysitter:
Care.com
Sittercity
UrbanSitter
SeekingSitters 
Nextdoor
user
I would also suggest asking your friends and family if they know of anyone who is looking for a job.

I would also suggest posting on your local Facebook groups.

I would also suggest posting on your local Craigslist.

I would also suggest posting on your local Nextdoor.

I would also suggest posting on your local Reddit.

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I would also suggest posting on
assistant
Before resorting to sources from the internet (stranger danger!) I would suggest asking around your neighborhood as many teenagers are looking to make some money on the side and might be wiling to assist you. In the event that does not work for you, here are some websites to help you find a babysitter:
Care.com
Sittercity
UrbanSitter
SeekingSitters 
Nextdoor
user
I would also suggest posting on your neighborhood Facebook page or Nextdoor.

Good luck!

Edit: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 1: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 0: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 2: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 3: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 4: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 5: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 6: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 7: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 8: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 9: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 10: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 11: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 12: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 13: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 14: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 15: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 16: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 17: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 18: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 19: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 20: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 21: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 22: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 23: I would also suggest posting on your neighborhood Facebook page or Nextdoor.
User 
assistant