The service and atmosphere of the dinner hour is just as important as how the food tastes. Ask your caterer about the number servers they plan to provide for for your guest list. If you are having a buffet, you need one server for approximately every 20 guests. If you are having a plated meal, you can have one server for every 15 guests. Also, be sure their attire will match your atmosphere. You may assume the servers will be in black tie only to have them show up in the company polo.
Talk cocktails and cake. This is where you will need to do some logistical work among your venue, cake bakery and caterer. You will want to make sure you (and your vendors) are clear on who is doing what. You do not want to pay double for both vendors planning to serve cake and cocktails or worse, no vendor planning to do so. Bartending and cake service may be options your caterer provides. If you choose to utilize them, discuss each of these services and have your final decisions specified in your contract.
How is your pricing broken down (e.g. food, bar, tax, gratuity)? A caterer should be upfront and clear about exactly what is included in their quote. If you are unsure, ask for an itemized quote. Many brides have blown their budget at the end of the wedding when they find that service and tax were not included in their pricing. For a large wedding, those two items could be several thousand dollars.
CATERING
What is the ratio of servers to guests, and how will the servers be dressed?