can someone help me i don't know how i can make an own server and is it free

You need a program

Go here for info.

several threads have info about this, use the search feature, set it to All Forums and expand the date range. Some websites for what you need:
Unreal IRCd http://www.unrealircd.com
ConferenceRoom http://www.conferenceroom.com/
Bahamut, DALnet IRCd http://bahamut.dal.net/

course, thats assuming you are asking about running an IRC server, not a fileserver.