What’s the best way to get a lawyer in this field, in this situation? I’m guessing “Google it” would lead to bad ones and scammers?
Referrals from business associates, angel investors, etc. There's a decent amount of various bits and bobs of domain knowledge that comes along with funding, and referring you to a lawyer is one of them. Past that, any good lawyer working outside their specialty will often know and be able to refer you to someone who can work inside the specialty you need.
Anyone advising specific actions to take in this thread that aren't "get a lawyer, preferably an expert in this field, and follow their advice" is doing you a disservice. This is almost certainly something you can't DIY. If the monetary amounts are too small to be worth a lawyer, you have very limited options.
Get. A. Lawyer.