WHERE would one go to begin the eviction process?

This would probably be a good place to start.

Another option would be LegalZoom.com

Landlord tenant law varies from state to state, and municipalities can have statutes different from state law.

Nolo.com has a good introduction to landlord tenant law.

And here is a site that provides help and information for landlords and links to state landlord tenant law. though some of the links seem to be dead. If so you can just google “landlord tenant law” for your state, which will probably take you to a link on your state Attorney General’s office’s website. The consumer protection division of your state Attorney General’s normally oversees landlord tenant law so you might want to call them too.

You just need to be careful, follow the law, and “cross your Ts and dot your Is” as the Nolo site warns. The courts take illegal evictions, lock outs, improper care or disposal of a tenant’s property, improperly withholding of a tenant’s security deposit, all that stuff, pretty seriously and you could find yourself with a lawsuit on your hands if you don’t do it, the eviction, legally and properly.

If you have a local rental property association, dues are usually pretty cheap. They should have all the forms you should need to begin the process and access to experienced attorneys if you require help.
The laws vary so much from state to state that it’s important you take your advice from LOCAL experts.