How would i collect a players input, I'm trying to make a teleport command so if they type "/warp area" it would say either "area is not a warp" or "teleporting to area" 

Create a command "warp"? And isn't there an existing Warp plugin.

Like how would i see if the message contains a certain word and if it does, say something. i know how to do that except the part to see if it contains the word. so how would i do that ?

Check arguments array length, then the [0] word.