This is the most vital part of picking on a style of wedding invites. You obviously have to know whether there is a specific theme to the wedding, to which you will accordingly order the invites for. Other styles, that are not in accordance with your style may be available along with seem more aesthetically appealing to you, but just remember that if you do not stick to the theme in mind, the whole wedding will turn out to be a mess because of compromising on every situation. So tick to the limited availability of designs according to your theme!
Price will without a doubt, be the second most important factor in helping you decide which sort of invitations you should be getting for that special day. Most brides and grooms have made a budget in this regard, and you already have not, than going ahead and setting out limits for different aspects of the wedding is certainly very important.
Wedding invites should be bought in a reasonable amount and not be too pricey because you do not want to spend a chunk just on inviting people, but instead, use it to make the event as good as possible.
Design is of outmost importance to you after you have picked out a theme and are settled with the price range a specific vendor has to offer. Get a design that does not seem to girlish and 16-ish with jewels and ribbons all over it, instead, go for the more mature and elegant look that will have people wanting to keep the card instead of see it as just a mere invitation to your wedding. Keep away from pictures of people, especially of yourself, since that does not look appealing at all and more amateur in nature.