LilRed, don't worry too much about the mistakes....most of us made them in the beginning ourselves...and still do from time to time. You learn as you go along. Start doing some online research into the types of fish you would like to have, and coming to a place like this to ask questions is a good idea too. Some folks can get a bit rude with their responces and comments...lol...but don't let that discourage you....they probably have good advice, just lousy manners....lol....so listen to what they tell you but research yourself too.
This is a great hobby LilRed....this is just a little bump in the road as your starting out...you'll learn ! We did...