Watcher ~ I bought my 29 gallon set up at PetSmart 4 years ago and it came with a Top Fin 40. I bought a Whisper 40(??30 maybe) to supplement that.
Read the sticky note at the top of this forum about cycling. Don't add any more fish into your tank for right now. You may, or may not, lose some fish during the cycling process. Try not to let it bother you too much, adding a ton of fish before cycling the tank is a big mistake, but hey, mistakes happen and we all learn from them.

Neons are rather delicate fish (ime and imho!), so don't be surprised if you lose a few more before your cycle is over.
Make sure the thermometer is on the opposite side of the tank as the heater. As long as it's an inside the water thermometer (as opposed to the 'tape' ones you mount on the outside of the glass), the reading should be accurate.
Snails, as someone else said, don't worry about snail control until/unless you have an outbreak.
Once your cycle is complete, you could add a rainbow shark or maybe some cories for the bottom, and maybe some zebra danios for the top level (they're very zippy little guys, and a lot of fun to watch).
There are tons of very knowledgeable people on this board, so don't be afraid to ask questions - the only dumb question is the one that goes unasked!!

~Tara