Agreed with others, basic commands. One thing on top of that is depending on your rank you can go further in help pages, ie. /help 3 lists Super VIP commands, only view-able by Super VIPs, and say /help 4-5 lists commands Goldies have access to, that way there is no unneeded listing of commands, and you can only view them if you need them. (Just saw this is basically what Egg said.)
And touching another thing someone else said, break it into sections, so
/help -shows-
2: Basic commands
3: Lot help
4: List of VIP group specific commands
5: Continuation of above if needed^
6: General FAQ
7: How to report or contact staff
Then say /help 3
"Need a lot? Type /getlot"
For VIP and up it could say:
"Have an area picked out for another lot? Type /getlotarea or /gl staffhelp to notify staff"