The contracts you are most likely to run into are SPT (Small Professional Theatre), Midsize and LORT (League of Resident Theaters or Resident Theatre Agreement). Certain cities and regions like LA (HAT & LA99), New York (Showcase, Off Broadway and Production), or Chicago (CAT) have contracts that are tailored to the region. If you live in one these area's you should look under the regional contracts to get an idea of salaries in your area.
Usually they are listed under the heading of "Salary" in the contracts. The index and rulebook is alphabetical by topic. The PDF's you can downlowd from the AEA website are really easy to use.