One of my little side projects is poised to start taking in some legit, non-trivial, recurring money soon, and I want to be ready for it. Looking for understandable, plain English info on the best ways to go about that: incorporating vs working as a DBA, copyrighting my company name, important tax forms, all that sort of stuff. I'm in the US.

I realize this is a totally bloated questions, so links or even terms I should google are super appreciated!

Thanks!