StarCraft II Launcher is a that let's you select a map, a modification and some player settings and it can then magically start the game with that map, modification and settings applied.
To play a map, simply download a map (it doesn't need any AI changes or stuff) from a site like http://www.nibbits.com/sc2/maps/. The Team StarCrack AI 5.0 is included in the package as an modification. The Free For All selection, the race, team and color for players are not yet supported. Don't ask about them.