Lupin ,
I suggest you build a config file that you can run with your server. Open a notepad or a text editor type a couple of commands that you want ran and save it as a .cfg file (myserver.cfg) something like that.(make sure when you save that you put the save as dropdown to all files *.* if you don't save it like that rename your file extension from .txt to .cfg) Save to your OpenArena\baseoa directory.
That way when you want to run your hosted server you can execute the commands without having to type each one in again. (exec myserver.cfg) in your server window.
here is a web tutorial that will help...
http://hosted.planetquake.gamespy.com/quake3/q3aguide/server-setup_a.shtml as far as the console commands go use
http://q3console.planetquake.gamespy.com/hope that helps get you started.