Call your local extension office. They'll know what's native and what's considered a pest or weed. They can guide you.
Fish & Game may help you too.
From either agency, you may get free seeds. Get a few fellow sportsmen to help you, and you'll get less suspicious looks.
And yes, you can get the local shooting, fishing, backpacking, birdwatching or camping club to help you, but I guarantee that things will get far more complicated than you can imagine.
Too many cook spoil the broth.
Keep it simple. Just you and a few friends. If you can get a go-ahead from Fish & Game or the County Extension Office, then you may be able to get free seed from a nursery, Home Depot, Wal-Mart, etc.
If you get free seed, write the company a thank-you note. A nice touch is a letter to the editor thanking them in the paper as well.
But that's about as much as you want to do.
Keep it simple.