You won't be able to for a long while. I don't know the specifics and I tried to find them a few minutes ago with no luck. You need: A few thousand posts. A few thousand credits A certain amount of +reputation Less than a certain amount of -reputation etc.
Draven quoted it somewhere. Enjoy. "In order to start a crew, the leader must have at least 25 postive reputation, and no more then negative 5 reps total. Along with at least 1,000 posts. All of this is required, as well as a 2,500 credit crew creation fee. To gain approval to become an crew/graphics group at GameRenders, you must agree to not create any outside site for any sort of purpose, except for deviantArt account and chatroom. No topics mentioning a crew, for recruiting purposes, or to see who would be interested in joining, are allowed without prior moderator or administrator approval. Use common sense, and if at all in doubt, PM a moderator. If you break these simple rules, the leader & co-leader will be held responsible for the punishment; often ending in a suspension or ban. If your still interested, please send a PM to any Global Moderator with the following information and they will validate and approve your crew! Crews with approval BEFORE July 14th, 2006 will be allowed to continue as normal."
The whole point of a crew (at least as far as I'm concerned) is about fun, it doesn't really have to have a point.
