Hi Marthy..
I seemed to have learned everything the hard way... I lost many a fish along the way.. my tank is now 8 weeks old.. and my fish are doing great, i've had the 1 female guppy and the 1 cory catfish for 4 weeks, and they are very healthy. Cycling can take anywhere from 6-8 weeks? (correct me please guys if i'm wrong) There's a "sticky" with lots of helpful information. weekly water changes, and lots of water tests until you get it right really(well that's what i did), until there's enough benificial bacteria in there to level out the system. I've learned a lot personally just reading on this forum
My tank is doing great now, I have live plants and they are thriving, i just added a few more plants and as well as my fish are doing great.. I added a 10 inch "bubble wall" today.. my one female guppy loves it!
I can't wait to get bigger, I think I'm getting a 30 gallon or so for xmas! going to make that into a community fish tank, and then i've been reading up alot of dwarf puffers..... maybe turn my 10gallon intoa home for one. Not sure yet =) One day at a time! (this whole fish hobby is addicting!)
Good luck

hang in there!
Sarah