Something that was much more beneficial to me than writing a check was attending Alanon and participating on this forum daily. Do you attend Alanon?
I would hold off on writing that check until you've learned all you can about alcoholism and codependency so you can make an educated decision. Otherwise, it could be money down the drain.
A good place to start on this forum is to read the stickies on the top of the forum. They contain a lot of helpful information.