Or... how about this... ?
All women are different... so just ask what she likes, becuase there are no fucking stupid rules. There's your 5 senses, and your instincts.
Also, big tip... vaginii and penii evolve in the womb from the same body part. (the clit being the head of the penis, and the innerlips are basically the shaft, and the outer lips are basically ball skin...) So imagine what it feels like to have someone scraping a fingernail against the side of it... or punching it really hard... yeah.... MOST people aren't into that. Don't believe everything you see in porn... (I've seen quite a few that make me want to cross my own legs for the poor girl who is choking back her tears as some douchebag is slamming his finger in and out of her basically treating her cunt like a punching bag... and she's just waiting to move on so her sore vag can relax a bit...)
The only "rules" are... (and even these will probably be wrong for some)
1. Don't be too gentle and lap at it like a cat... you can nibble, and get in there.
2. You can be rough... but don't break the damn thing.