Perhaps you'd start by stimulating the more sensitive parts of a female's body, no? I'm rather positive there's no "best" way. Simply whatever the girl at hand prefers. Therefore, the best way for that girl can be discovered by simply asking her what she likes.
Yessir. General Curiosity is for puberty questions, not sexual questions >>
To the OP: all girls are different. What works for one girl isn't going to work for all girls. They key is to communicate with your partner so that you know what works for her and what doesn't, what speed to go at, what to keep doing, etc.