It is really important to choose the right dinner for your wedding and not only the right one but also the best one. There are 3 kinds of dinner you can organize which can suit your budget.
The cocktail dinner, it is the most cheaper because yours guests will stand and they will not sit. It doesnt require a lot spaces, avoid to have too much waiters and you will not need to rent a lot of tables, chairs and other complementaries (but you need to have some chairs and tables because your guests need to rest, moreover if there are old people).
The buffet, you will need chairs and tables since your guests have to seat if they want to eat. You will need waiters to serve the food to your guests and also a head waiter who can take care of the right portion of foods for your guests. But not only that, he is here to supervise any incidents which can occur.
The dinner, it is the most expensive but also the most classic wedding dinner. Normally you will have to reserve a room only for you in a restaurant and the same menu is serving for all guests.