First off, do you understand and know the relationship between film speed (ISO) and exposure (shutter speed and aperture) ? If not, read and study and understand, it's all very simple. If you don't understand this, you probably won't get very far because you won't understand what's going on.
That said, if you already do know and understand this, disregard the above paragraph. I'd recommend just starting with cheap Kodak color film. If and when you get into black and white and black and white developing, I'd recommend Ilford HP5+ as this has been a very easy film to develop in my experience.