Also would like two or three little snails too which would be the best kind to get?
I think it's better not to keep snails. They are prone to bringing parasites into your tank.
And some parasites will take a long time to eradicate from your tank.
And if you have plant and sand in the tank, it's almost impossible to eradicate them from your tank. The plants will absorb the medication and reduce the medication effectiveness. The sand will provide place for the parasites to hide and probably avoid being killed by the medication.
Parasites will kill your fish slowly especially the gill flukes. And some parasites like Ich(white spot disease) will kill your fish fast if you don't treat your tank with medications quickly.
I forgot to tell you that you have to buy an air pump and air tube (about 1.5m long depending on where you place your air pump).
Next, you might want to learn about how to pick/select healthy fish.
Most of the fish stores' tanks have parasites and bacteria.
So, you have to choose the fish carefully to avoid picking fish that have disease.
Whenever you buy new fish, there is always risk of bringing parasites and bacteria into your tank.
You can search internet on how to select healthy fish.
Or if I have time tomorrow, I can send you some links.