Congrats!!
I'm sure you'll do great!
I think having knowlage is powerful in a pet store. And even more important, admit it, when you don't know.
I bought fish from a local pet store. And the owner of store actually sold me 2 sharks and 2 blood parpt fish, for my 10 gallon tank..
I was so happy with my purchase till I got home and called SIL, she was like you got what... (I didn't know anything about fish) So he got this one sale from me, but for now on, I go else where for all my pets needs.. I go to a store, where the young lad, actually will say.. That's not a good idea to buy that..
so not that you need advice, but be truthful.. If you don't know anything about it.. People would rather that, then being lied to for a sale..
Congrats again!!
I'm sure you will do great!!