Commands
.playerbots bot addclass warrior (Spawn AI bot, this is using warrior as an example)
talents spec prot pve (Change AI bot spec, this is using Protection PVE as an example)
autogear (Use tell to have AI bot's gear automatically outfitted to match its spec)

follow (Use tell to command one AI bot, use party or raid to command a group)
stay (Use tell to command one AI bot, use party or raid to command a group)
summon (Use tell to command one AI bot, use party or raid to command a group)

accept * (This forces an alt bot to accept quests at a quest giver.)

.playerbots bot add [name1,name2,name3] (Log in your alts)

HERE IS A FULL LIST OF COMMANDS