Broad guidelines. You need to start somewhere. The following markup suggestions may help:
Cocktails, 3 1/2 - 4 times cost
Other liquor, 4 - 5 times cost
Beer, 2 1/2 - 3 times cost
Wine by the glass, 3 - 4 times cost
Carafe wine, 2 1/2 - 3 times cost
Dessert wines, 2 - 21/2 times cost