Going down

My boyfriend is in the military and has been away for a while. He comes home in about a month and has been expressing his want to eat me out. I'm nervous for this to happen but also love the idea. I'm scared it might smell or taste bad, I'm scared of discharge or something getting in his mouth (I constantly have discharge enough to wet my panties), in scared he won't like it. I don't know. Any advice on how to lessen my fears, enjoy it, prepare...