What do I taste like? Advice?

My boyfriend wants to eat me out next week and we’ve never done that. I’m scared that my hygiene isn’t good or maybe I taste bad or maybe I have stuff in my vagina. sometimes I’ll pull out a mirror and open my vagina and i see white/yellowish stuff and then I’ll clean it out and it looks like a stain on the wipe, kind of like discharge. Any tips? How do I clean? How do I make myself taste less bad? How do I know if it’ll be good or not?