First off let me apologize for the bad experience you had. Not sure what kit you were brewing since I have 3 kits that have only 3lbs of LME. The Outback Honey Ale (also includes 2# of honey), Sprit of St Louis Lager (also includes 2# of rice extract) and the 10,000 Lakes Light Lager (also...
You have some of the basics and are off to a good start. I would suggest getting the "Complete Joy of Homebrewing" one of those titles that everyone has in the library. I taught myself how to brew 20+ years ago and it's a classic. Might want to try some extract beers to get your feet wet but...
Let us know how those well aged beers turned out. I was helping a friend move and we found a 6 pack of pale ale that he brewed 5 years ago. It was fantastic.
You can also freeze the LME. If you have the room in the freezer I would just freeze the whole kit. (Take the liquid yeast out and put it in the fridge though!)