how do i upload and play a map on a server i made?
EDIT: if it has to be a pk3 file, how do i make one?
RTFM (http://tremmapping.pbworks.com/Starting+Tremulous+Mapping)
ZIP? please explain to every step to me because i dont really get it. how do i make one and how do i add it onto a server?
Make zip wheres folders like maps, textures, scripts, etc...
Change .ZIP to .PK3, just rename it!
so technically make a zipped folder, put all the map files in it and then rename it to a .pk3?
Yes.