I had no idea what to ask my agent when she first called me lo these fairly many years ago. Here is Kristen Nelson offering tips for that moment:
I will say, I don’t see and don’t care about the initial version of any contract. The final version shows what changes have been made. Generally there are lots and lots of changes. I don’t need further assurance that my agent is determined and tenacious when negotiating. Especially since she does update me now and then if she is going back and forth with a publisher on one clause or another (generally the noncomplete clause, but there are others).
Anyway, if you should be in the position of deciding whether to sign with one agent or another, here you go, this should help.