[Pete F.]

I would start off by roughing out a business plan together with the other party.
This involves writing things down and assigning values.
Figure out what each of you are bringing to the table and what you think it's worth.
What would be fair compensation for the part you each are performing.
How the whole thing works and makes money.
What type of organization you think will work well for both parties.
By the time you rough this out you will have a fair idea of how she deals with business and you.
Then make up your mind about the lawyer investment, or maybe just walk away.