You can use a pop-up box to offer a complimentary checklist, maybe try “Get Our Guide to Hiring a __________ for Your Wedding,” or anything of real value to the bride/groom visiting your website.
Pop-up boxes probably fall into the category of advanced Internet Marketing and require more than a basic understanding of online marketing and programming.
The tool I recommend is called Opt-in Monster. It’s a silly name but a powerful online marketing tool. It is the “Cadillac” of pop-up box marketing and management.
You can learn more about it at this link: http://optinmonster.com