Have you made any maps yet? Most people won't want to forge with someone when they don't know a thing about their forging skills.
- Can you interlock and geomerge effectively?
- Do you know the basics to map design? i.e. Line of Sight and Risk vs Reward
- Can you highly comprehend Halo's spawning system? Can you effectively place spawns, spawn areas, etc.?
- Can you effectively place weapons, equipment, and vehicles so that the map is balanced for symmetrical/asymmetrical play?
- And arguably the most important: Are you original in your forging? Can you design and create something that nobody has ever made... something that will blow people away?
If you answer no to a majority of these questions, most experienced forgers will not be willing to work with you.
I myself did not do a collaborative map project until just recently, about half a year into my forging career. I had to learn the basics and advanced components about forging before someone would forge with me.
To further this, go to the below link that leads you to a thread made specifically for getting people together to forge.
http://www.forgehub.com/forum/halo-forge-discussion/77246-forgemates-you-looking-someone-forge.html