I'm assuming you mean FP4+. It is a wonderful, flexible film. It will work in a very wide variety of developers. Exposure index and contrast depend on your working methods and your preferences, so you'll have to test for yourself. Some people rate it at its ISO speed (125), some people prefer to rate it lower (100, 80, 64 etc). You'll have to decide for yourself based on testing and printing. I would suggest starting with a standard general purpose developer such as Ilford ID-11 (Kodak D-76).

If you are used to shooting Tri-X you might prefer a faster film such as Ilford HP5+.