Well I would suggest a smll tank first, incase you don't fancy the hobby,
Then if you do, you go bigger.
I got a 54L tank and have now upgraded to 240L (the biggest if could afford and with space in house).
My tips,
Don't overstock the tank. But if you have already, make sure you get an airstone and more plants to help with oxegen levels. This is a quote for my 60x30x30(CM) tank "We would recommend keeping up to 11"/28cm of small to medium-sized fish in your system. However, depending on the type of fish, your filtration and your maintenance level you may be able to exceed this to a suggested maximum of 22"/56cm of fish. " (from practical fishkeeping website)
But I would stick to less is more approach...
Buy Protozin from Waterlife (incase you get spot disease) I got that and only managed to sort out my fish a little too late, two neons died

.
Change water every week, between 10-30%. I prefer real plants. Ask you LFS (local fish shop) for hardy plants.
Don't worry too much about snails, only if they become too much. But I have found that the snail population gets to a certain amount and stays like that. But it depends on water quality.
If you have any questions ask everyone and ask your LFS, I found going to three different Fish shops and asking the same questions sometimes, you can get more info.
Try to read up on aquascaping, that can give you ideas about seting up a fish tank. I prefer real plants to fake, but it all depends.
Good luck and hope you enjoy it...