Everything You Need to Know Before Purchasing Wedding Invitations
First Things First, the Guest List
Invitations should be decided once you have the guest list. Once the guest list and the budget are determined, you may have to make some adjustments to one or both to accommodate everyone.
Split the Guest List
It might help to split the guest list: half for the bride's side and half for the groom's, or a third each between the bride's parents, the groom's parents, and the couple.
For a count of how many invitations should be sent out, you should make sure to include every couple, single guest, parents, and the person performing the ceremony.
If you're not sure about whether or not a child of an invited couple should receive his or her own invitation, a good rule of thumb is that any guest over 16 years old should receive his or her own invitation.
Guests of Guests
Be clear about whether or not your guests are encouraged to bring guests of their own or you might be faced with the awkward situation where they have to ask.
Allow for mistakes, and expect that you might think of someone you had forgotten to invite initially. Ordering and extra 20% more invitations will cover for those possible unforeseen errors.
Don't forget to have back-up lists ready. Some guests may decline, and it's a good idea to have a "b-list" ready to fill those spots as they become available.