I am kind of excited for you, to be honest. Well, since I don’t know you or the role you are hoping for, I will just speak under some assumptions.
Assumption #1: you are looking at being the submissive one in the D/s dynamic, and he the Dominant.
Assumption #2: you have always taken care of everything, and you need to feel that “take charge” dynamic so you can finally release this side of you. I apologize if this is wrong, but I am guessing it is not, since this is somewhat common for women who are kind of alphas in life that look towards D/s.
I personally think if you do it right, you may achieve a level of intimacy and happiness that you didn’t know was possible. I highly recommend learning a lot first. Read, as much as you can, not only on D/s sex, but more importantly on the D/s dynamic in relationships. Understand the types of BDSM relationships that are common and see what might fit for you, such as Dd/lg, Master/slave, and more. Get to know the ideas of ownership, especially collaring, and how big of a step this is.
Above all, expect that you will expose complete and total vulnerability to one another – you know those thoughts you have but you never really say in a relationship? Those ones that may feel needy, or hurtful, or anything else – where you kind of bite your tongue and hold it in? Those all come out – for both of you. But if done with love and care, you will see how amazing and beautiful it is. I highly, highly suggest keeping a daily submissive journal for your Dom, which he will read, give advice on, listen to your inner thoughts, and give you his. Now he needs to do all the same things you are doing – read, learn, understand body and brain chemistry for scenes that will be intense with sub drop, understand aftercare, and be responsible not only with your body but your emotions. I hope you guys both read this, both take it to heart, and start learning before you dive in.
There are a lot of good resources out there, some great blogs here, some dumb ones too, and you need to spot them. It is pretty easy to see a dumbass fake pretender who hates women and a loving person who uses D/s as a means to develop a closer bond with the person he or she cares about. I am kind of excited for you, actually. You are just about to get married – you have your whole life ahead of you with this person and you guys can grow so close. It really sounds pretty amazing. Best of luck.