I have to agree with jhnmarton. These things should be natural. Not one of us can tell you, because every single woman is different. What one woman likes could very well be a turn off for another. You will have to get to know your partner and what she likes and responds to. The two of you should be open enough with eachother that you can try new things, and ask her what she likes.
IF you are asking such a question may be you are a little young for sex?
As these things come naturally... And there is no obligations or should's - you do what you want to do and your partner does the same from her side.
Should we give oral sex pleasures to our lady every time before sexual intercourse (penetration) ?
You might want to first establish a nice background setting that is conducive to lovemaking, i.e. subdued lighting; soft music; and a comfortable location for relaxation like a hot tub, the shower area, or a nice soft blanket/ bed/ or sofa upon which you can both lie down on. Then, start fondling... kissing... nibbling... and gently caressing your partner.
it can start long before you go to bed..a light touch on the shoulder after dinner,or a soft touch to her face and a quick kiss..a rub on her butt and maybe a deeper kiss, stroking her hair, help getting thekids to bed..as you're getting ready for bed,slowly undress her and kiss her from forehead to nape of the neck to nipples, rubbing her butt and light kisses..that might be a good start.