Definitely some good tips here, but I'd add that if you're planning on fingering, make sure that your nails are cleaned, trimmed, and smoothly filed. Your effort will be appreciated.
You'd think this would be obvious, but I've been badly scratched on the labia and on my asshole many times. Sometimes I haven't noticed I was badly scratched because I was so aroused I couldn't feel it at the time, but the next day it becomes swollen and can even be painful to walk around, so try and avoid this! A good manicure and short buffed nails with no rough cuticles is
essential.
I love it when a man begins oral sex by kissing me while he uses his hands to play with me for a while before going down, but I'm a huge fan of kissing. I love it when he slips his hands down my pants and into my underwear and starts playing with me before we've even gotten undressed, but it doesn't work without a good manicure!
Also, facial hair! Again, I may not notice how badly scratched I am if I'm very aroused, but the next day can be ouchie.
Every woman likes different things, so you need to urge her to communicate with you. Most women are afraid of being too bossy or critical, so you need to take the lead if she's not telling you what she wants and ask her to tell you, which will re-assure her that you're cool with being told what you want her to do, you want it. Plus, she'll adore your attention and your desire to please her. It's a real turn-on.
I like it when a man takes an occassional break from the clitoris and takes a lap around my labia, tracing the tip of your tongue around the inside and outside of the labia and returning to the clit again. An occassional big ice cream lick from the bottom to the top with a flattened tongue a few times is also excellent. Sucking on the labia feels soooo good. Depending on how aroused I am sucking directly on the clitoral hood is amazing, unless I've become too sensitive for that much sensation there, which should be obvious based upon her reaction! I also love being kissed on the outer labia and the areas around my pussy, not just directly on the pussy.
I also love it when a man uses his hands a lot while he does it. If you keep your hands moving slowly around her inner thighs, the areas around her pussy, and above, even all the way up to her hips and her breasts while you lick, it's just the most luxurious feeling.
I enjoy it when he puts a finger in my ass and slides it in and out when I'm nearing coming, but not more than one because of knobby knuckles and the cold air that gets in there when you put more than one in at once.
Sliding a few fingers in and out of my pussy sometimes is also welcome, but some guys have begun doing that and never stopped and it becomes too repetitive. Mixing it up makes for a much more unforgettable experience!
Pay attention to the sounds she makes and remember what makes her the loudest or moan the most and repeat those particular moves over and over again. Her voice is a great guide! Sometimes I really can't tell exactly what he's doing with his tongue, so I can't exactly describe it to you, but my vocal responses during that great thing just now can communicate very well that I liked it, if you're paying attention.