Visit other dojos make friends with the people you'd like to work with go to their home talk about sparring. Visit Kung-fu, Karate, TKD schools make friends build a sparring group. Note make friends without this element being that you have never sparred before you could get hurt badlly, Ko, Black eye and tooth knocked out. Sparring people too far advance under black belt without a referee is danagerous. Enroll in open tournaments at your rank, this is kind of safe. But with no experience you gonna get waxed and your $35-$60 lesson is gone in 60 seconds, you learn nothing except u got hit. You can get the wind knocked out of you pretty bad.
A black belt will evaluate your movement and spar accordly if he wants to. A kyu level sometimes is take no prisoner unless you are real good friends.
The safest thing is wait for you Sanbum to start you guys sparring in your dojang. I never seen TKD club that didn't do plently of sparring.