Congratulations on your upcoming wedding!
I guess my first question should be "are you currently taking lessons?" From the sounds of your post I would think you haven't taken that step yet. Please do!! So many times we have had people come to us (my husband & I both teach) just a few weeks before their wedding & ask us to teach them to dance. This is very frustrating for us as instructors!
To reach a level of "comfort" on the dancefloor, most people need a minimum of 6 to 8 months worth of lessons, either in a prvate or group setting.
So, my advise to you would be to get on into your local ballroom studio & sign up for some lessons! Consider it an investment in your marriage - this is something you will be able to do together for years to come!
Have fun!