Chatbox Commands

Well i want to make a few commands, for Admins 

Head admin or owner can kick , admins [got some admins which can get emotional don't really want to remove, their rank and such/

something like a warning system so if i typed /warning "name" their name in chat would get a Dark red or something that goes over heir name until i type /reset "name" or something like that. 

finally a time clearer, so /clear "60seconds" or something like that.

thank you