Games have come in all sizes over the years. You need to quickly figure out where your new collection is going to go. Unlike many other collecting hobbies, cramming games into a box doesn't make them very accessible to play. They almost call out to be displayed. There are many types of media racks and storage bins, and everyone has their own style. Some even build custom shelving. You may already have a room in your home just waiting to be packed full of a library of titles.
You need to know how much space you're willing to give up to this hobby. It can rapidly become premium and an unkempt room will descend into a mess. These things need planned out before you bring that first massive lot home from a flea market.
Doubles
There's an easy way to finance this hobby, which can be expensive. Buying in lots will always be cheaper, but don't turn one down simply because you already own a few games. Those can be resold online, or even traded for games you do want. In some cases, you may find a few games you were searching for only to resell ones you already had at a profit. Not only did you get to add to your collection, you made some extra cash on the side. That's a sign you're doing things right.
It's not always about the games
There are other things involving video games. You can focus on gaming magazines, posters, t-shirts, or other promotional material. There are many ways to get this, but most people have success by befriending a local game store and simply chatting. The more they know you and the more you patron their store, the more they'll be inclined to give small handouts. Reserving a video game at one of the major chain stores is a guaranteed way and most of the merchandise will find a way to the internet eventually. The trick is not to annoy them or keep them away from their work. Be as casual as possible. Make sure you're up on the latest games too, as there are many employees who will simply ignore people who don't understand the industry.