Getting oral for the first time ? ! Help !

I'm 18, college student, and I'm not a virgin. But this weekend will be the first time I will be receiving oral. My questions are down below.My friends say it feels really good but I'm different when it comes to sex. Sometimes clitoris stimulation doesn't feel good, it just feels like someone is touching me. (I've been fingered before).  
What if I don't like it?
What if I'm not wet when he goes down
What should I eat? Fruit?
What do I do? Just lay there ? 
What if I don't smell good to him ?
I think those are all my questions.... 

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