Welcome! Have fun in your exploration, first of all, and play safely.

You can't make someone into a submissive (or dominant) if it isn't part of their personality. They can fake it, but it's never real. That being said, I suspect you mean that your wife has either a high responsibility job or is just generally take-charge in her attitudes. (I may well be wrong, and if that's the case, just ignore me.) You and she need to talk it out and figure out what you're both looking for from this lifestyle. Do you both want it to be something you live 24/7, or do you want it to be bedroom play? As the dominant partner, a great burden of work is on you to figure out her mindset and attitudes towards submission. What it means to her may not be what it means to you. Basically, communicate your needs with one another. I know this isn't the sexy answer, detailing ways you should beat her into submission, but... well, I assume that's not what you're after.
Remember, no matter what anyone tells you, there is no One True Way of doing this stuff. As long as it doesn't venture into the territory of abuse, how you proceed is based on your needs and her needs- which is both exciting and scary. There's no handbook to being a perfect Dom, but there are tons of articles you can find on informative sites about what it means to other people to be in their roles.

I hope that helps! (I'm sure you will get plenty of good advice here, even if mine doesn't help in the slightest) Again, good luck to you both!