I would second maddoc's suggestion. Pick one film and one developer, and do 10 rolls or so before trying another. Write down the developing time, temp, and agitation on the negative sleeve for each roll. Once you get an idea of what you like or dislike about the combination, you can vary it and try other combinations. With experience you'll find a film and developer which express what you want in your photos. Eventually you'll be able to vary time/agitation/developer to achieve your goals. It'll be better than sliced bread, even! (Do post your photos, too!)