Yeah I know how you feel I was scared too of the cycle but I finally got my 5 gallon cycled half a month ago, and dont worry will help you every step of the way. Do you have the testing kit yet ? If not the API Master Freshwater Kit is the best and Amazon has the cheapest prices on them if you can order on line.
Not sure yet about which type to get, maybe one like yours if I can find like a bigger one maybe. Yep I had some pond snails on some live plants I put in the tank and I think they are finally all gone from the tank but one of the last ones I saw in there he ate, not the shell though which I was worried about but found it on top of one of the moss balls. I looked over and he was chewing and chewing and he spit it out only to get it again and chew some more...oh goodness he is a little clown..lol