Find some climbers, then go find some trees biggest challenge for rec climbing is finding some places to climb. If you or your friends have some climbable trees on your own property that's a good start. I've spent years scouting the woods in my area to find the good climbing trees, takes time.
-AJ
Also check out for any guidelines in your area that may hinder certain activities of clubs, just to avoid any issues in the future when the club becomes more recognized. Check out Google maps in you area as well to find any locations that may have dense trees if you don't have any nearby or on your own property.