The average tip for a waiter or waitress at a restaurant is 15-20 percent. There is no obligation for a host, but if they go out of their way, $10 is a good tip for them.
There is also no obligation for take-out orders unless it was a complicated order, then 10 percent is a reasonable tip. For home delivery, the tip should be 10-15 percent of the total bill. Bartenders typically receive 15-20 percent of the drink tab or about $1-$2 per drink. For luggage, the tip should be about $1 per bag. Doormen are tipped when they carry luggage or haul a cab. A tip of $1-$3 is good for a doorman.