okay i dont know anything. Can someoen tell me what to get and etc.
I am making a forum for my school.

Well this forum is the same as I use.  It’s a phpbb forum which you can get at http://www.phpbb.com

in order to use this you need a server that supports php and mysql

once you get that.. then you can start one up… there are other types of forums but i like phpbb the best