- Program files/multitheftauto/mtaserver CONF file, edit the details in there, password the server, what map etc then save.
- Run the server ( Download the patch if you havent ).
- Find the Multi Theft Auto 0.5 Admin Console, type the password, make sure the server is running.
You need mIRC to install MTAmA, once that is loaded then you can add possibly MTA:mA:GRS Script or other scripts to whatever your liking.
http://www.aeron.tk is a useful site to begin with.