Create a direct marketing letter for Mailing List of brides

I buy a monthly list of brides to be from a company called Selectabase. As of yet, i have done nothing with the three months worth of leads as i do not know how to start the campaign. I need an effective marketing letter put togesther to send to these brides along.
to help you please research my websites www.bombonieraevent.co.uk, www.bombonieraflowers.co.uk. www.bomboniera.co.uk to see what services we offer.
The main aim of the letter should be to offer wedding decor services to includes flowers to these brides. Maybe a discount voucher can be enclosed as a incentive. we can also include a flyer like attached along with a price list. Please give me ideas. Ideally the person who gets this job should have some experience of this marketplace