It's almost inevitable you'll get those common pest snails I think.
When I started my tank, it was clean, no snails. Then I bought some plants 'n things from the LFS and suddenly snails started turning up, they piggy backed their way in.
Even when I bought new fish from the LFS, what little water that was inadvertently transferred over with the new fish into my tank, within a week or so I started noticing a new type of snail moving around in the tank.
You should totally hog the forum and ask any and all questions you have, it'll be better off for your fish if you know how to look after them from the get-go, rather than limiting yourself to one question a day. By the way, the snails weren't visible on the plants or in the water with the new fish, I think they were either very very tiny babies at the time or there were tiny eggs floating about in the water. I transferred the fish with a net too (after acclimatising the fish), so it wasn't like I poured the water from the fish bag into my tank or anything.