Party Planners- please help?

i am having a surprise 50th birthday party for my sister. there will be about 40 people there, start around 2pm. i will be supplying the food and booze. the items on the menu will be meatballs and sausage, chicken, shrimp and chorizo, pork loin, hot dogs and burgers (for the kids) and a few different sides. sangria... show more i am having a surprise 50th birthday party for my sister. there will be about 40 people there, start around 2pm. i will be supplying the food and booze. the items on the menu will be meatballs and sausage, chicken, shrimp and chorizo, pork loin, hot dogs and burgers (for the kids) and a few different sides. sangria will be the main drink, but of course i will have beer, wine and liquor (there will be a good drinking crowd). we are on a tight budget, so what is the best way to figure out how much of each item i need? any input, ideas will be appreciated.
thanks
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