I'm trying to put my RV into the breaker box I've got a 30 amp breaker double pole I've got10/2 wire, do I use a single pole or double pole 30 amp breaker hand my RV plug is a 4 prong plug how do I make this work
RV's typically take 120VAC with an oddball 30 amp receptacle: this.
It will work fine with your 10/2 wire, but your breaker is 2-pole unnecessarily - a single-pole breaker would do. (Though, a single pole 30A breaker is kind of an orphan, hardly used for anything - the 2-pole breaker is commonly used for several purposes.)
Neutral goes to your neutral bus, ground goes to your ground bus. Hot goes to one side of the 2-pole breaker, the other side is unused.
If you wanted to use a NEMA 14-30 connection, you bought the right breaker but the wrong wire. But it would surprise me if you wanted that since 240V/30A is not common with RVs, usually it's 50A if it's 240V.