I can explain that for you.
Search and destroy is a game that is found in most call of duty games, where you choose your class, and attempt to kill everyone. There are two ways to win points (win = 3 points) kill everyone and have more than 0 players. The other way is the to plant a bomb in a specified place out of two, while the players are attempting to guard it however they can. When you die, you stay dead and spectating until one round is over (one round = one point.)
I personally do not like this concept, because Search and Destroy made me rage SO much on Call of Duty, but I also like it, you can try and replicate the favourite call of duty maps and add them. The problem is the kits, would make it EXACTLY like call of duty (having guns etc) or have general minecraft kits..