Advice on oral

For context, this is both mine and her first times being in a relationship/intimate with another person. I really want to make her orgasm but when I go down on her she says it feels good but she isn’t getting close to finishing, I asked how she wants me to do it or if she can guide me but she said she doesn’t know and maybe it’ll come with more experience, because we haven’t done it more than a couple times, and haven’t had sex yet either. Any tips? I just want to make her feel good too.