Start with time of day. Afternoon, or evening is the normal choice and part of that is decided by when your ceremony is. But if you have a late morning or early afternoon ceremony, then you have more choices of time of day of your reception.
If you are going to have your formal pictures taken after the ceremony, if you want to ride around with your wedding party and go to a park or a bar, or if you have something special you want to do with your photographer or videographer, time must be reserved for these activities. Each of these activities pushes back the start time of your reception.
Do you want to have a cocktail hour at your reception? Do you want to be there for the cocktail hour or are you going to be doing something else like pictures, video, or riding around on a bus during the cocktail hour? If you do have a cocktail hour, be sure there is plenty of seating for your older guests.
But what if you have a longer gap between the ceremony and reception. What are your guests going to do while you and your wedding party are taking pictures and having fun? For the local guests, many will go home, but your out of town guests will be stuck with nothing to do. Help them out by reserving a bunch of rooms at the same hotel so they can go back and relax and catch up with other friends and family members. If you really want to be nice to your guests, book your reception at the same hotel and this solves a bunch of transportation issues too. Also, if there is a lot of time between the ceremony and reception, some of your busier guests may choose to come to one but not the other. The longer the gap, the more this will happen.
For more advise to help you plan your Omaha Wedding, go to OmahaWedding.TV.