What plan should white play with? It's black's turn. What plan should white use so as to confirm it's win? Thanks! 

 [fen "r1b5/ppkn3R/3p2p1/8/N2b1B2/8/P1P2PPP/5RK1 w - - 0 50"]
White is an exchange up with a much safer king and more active / developed pieces. There are many ways to win. The most straightforward here is to exchange pieces where and queen a pawn.