I highly recommend E Gerber Mylites 2 mylar bags and boards for storage. 100 times stronger than the poly bags and will make your comics look great!
I catalog my entire collection through Comic Collector. They even offer apps for your ipad, iphone or ipod Touch as well as any Android device. Maintaining a collection this size would be impossible without a cataloging program.
Expedit shelves from IKEA and filing cabinets provide storage for my collection.
Noteworthy events such as first appearances or deaths are noted using Avery labels with the help of the Marvel Comics Database. http://www.marvel.wikia.com
I find most of my comics locally at these fine establishments/conventions: