In the past, I have paid outrageous amounts of money to file an LLC. Some API's require me to have a Business License, Tax/VAT registration, or Certificate of formation/incorporation so I'd like to file for Jemsplash.
Stripe Atlas is pretty affordable and will take care of all the things you need.
Link here: https://stripe.com/atlas
Most states will walk you through it on their website, but you can also check out Nolo or Incfile.