Really… It is all about how you feel. It’s good that you want to try it out first so you won’t feel shocked or anything when you and your boyfriend take the next step. Make sure you are alone and completely comfortable and you have some time and the best thing to do is just experiment. Get to know your body better. I would start with one finger and go as far as is comfortable and pleasurable. Every woman is different, so you will have your own personal preferences as to what you prefer. I also suggest playing with your clit… if you know what that is… If not, it’s the area right above where you stick your fingers that feels really good. I think you will get it once you find it. And yes, that is the right place.