Good Evening, Erin,

1--Both film and developer manufacturers usually have data available, either packaged with their products or on a web site.
2--For an overall view, try to obtain a good general introductory book on photography, one which is a few years old may be devoted entirely to chemical photography rather than digital.
3--Do a search on APUG using the name of any particular film or developer; there'll probably be information available here.
4--Post questions in the Forum about particular film or developer combinations and you'll probably get answers (opinions??) rather quickly.
5--Do a Google search for specific films and developers. There is, for example, an entire site devoted to Kodak's HC-110 developer.
6--Practice and experiment!

Konical