How to install and wire up a 30 amp breaker box acceptable to plug my RV in
RV's typically take 120VAC with an oddball 30 amp receptacle: this.  


Note the center hole is not a terminal.  

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.