I want to know how to finger a girl and it's my first time?

Start with one finger first. Gradually add another finger. If she wants more then slowly try to git the whole fist in. If she wants to suck your penis she will if she doesn't then she wont

ok this is what you do. start out with a warm soft kiss then gradually start to make out. that point when she wraps her arms around and squeezes u in that the point where you make you hands to her breasts. play with her breasts for a lil bit that will get her aroused. then work your way down to her vagina. rub the outside of her pants first to make sure she is ok with it. and if she lets you do that. work your way inside. when inside rub your index finger and middle finger up and down on her clit then gradually stick a finger in and finger her. ur most likely not gonna be able to fist her.