You're definitely in the right place to have your questions answered. To learn more about film, its behavior, and development, I suggest the Ansel Adams series (The Camera, The Negative, The Print) of photo tech books. You'll get a lot out of them. As to film choice, and my 2 cents added, my vote goes for TRI-X/D-76 combination. For street photography, it's a "classic" look and feel, and very versatile. You might also want to try HC-110 as a developer with TRI-X. This should be a good place to start; learn what these combinations can achieve, and then experiment with others. Oh, and don't forget to have fun! Good luck!