[rmah]

This is contract law. Most general or transactional (aka business or corporate) law firms -- as opposed to criminal or family law -- will handle this sort of thing. Contracts are the bread and butter of lawyers. It's what they live for.

I would suggest a solo or small law firm as your business will be more important to them. And attention to the agreements you have questions about is actually what you're looking for. Larger firms will probably just hand you off to a paralegal with a quick review by an actual lawyer. And then charge you way more.