Can the SBA advisor point you at a lawyer? Are there lawyers in your area that partner with the SBA? In my state, there are law firms that everybody knows has focus on early-stage companies, and surprisingly their fees are reasonable (though they may put you with a junior lawyer).

Often people are scared to talk to other professionals - accountants, lawyers, etc - because they think it will be crazy expensive. I've been really pleased with how affordable their services can be for basic consult, documents. It's only when you are in litigation that it gets crazy (don't ask me how I know). So - it might be just a couple hours (let's say $600 or so) for some of their time to get all your questions answered. In fact, I've found a brief coffee with a lawyer will often answer all my questions and that only if we have to do something with them after that point does the meter start running.

Point being: Get comfortable talking to these people, they are your allies.