The best advice is ask her what she likes.

My personal feeling is start slowly and gently and wait for her
cues. I'm married 18 yrs. and LOVE oral sex, by now hubby knows
what to do to send me over the edge.

But it took time and patience.

Also, let her know you're enjoying it. There's no bigger turn-on
than to know your man loves the taste of your pussy.

I love the sounds of oral sex..................the slurping, and licking
noises turn my thighs into a set of vice grips. I also love a long
lingering kiss afterwards, I love tasting my pussy on his lips.

I guess what I'm saying is, be gentle, be loving, and be sensitive
to her feelings and do what feels good for her.

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What is essential is invisible to the eye
Only with the heart can one see rightly.