My boyfriend is very dom and its great. This being said, we like to change things every now and then and this has led to my boyfriend saying he wants me to be the Domme and him to be the sub.
I have no clue where to start. I'm ok with the spanking, tying, edging its more on how to meet his request to be emotionally and mentally dominated as well as physically! What would I say?!!?!
Congratulations! It's so cool that your boyfriend asked you to top him.
Here's my basic advice for new tops
Keep it simple. Don't try to do everything that you/him/both want to do. Pick just one or two things to explore in one encounter and add that to your existing hot sex life. If you try to do too many things all at once, you massively increase the potential for a blah or bad scene. Building both of your confidence in your new-found roles and having fun are your primary objective here.
Example: Blind fold him, tie his wrists and have him sexually pleasure you (in all the ways that the two are you already do). The only difference is that he can't do things to you until you give permission. Think of this as an X-rated 'Simon Says' game.
If you would enjoy books or videos for instructions, let me know and I can give you recommendations.
We're heavily into anal and he's starting to enjoy receiving as much as he does giving. He's asked me if we could try a double ended dildo together (again something I'm not sure what to do or which to buy!)
Typical 'double dildos' are really annoying for us gals as they're not built for our bodies.
But a few are being made with actual bodies and actual sex in mind.
The
FeelDoe line is such a product. The short fat end goes inside the woman's vagina. The ridges on the shaft stimulate her clit and the larger/longer end is for the partner (of any gender). It may look long, but remember that part of the shaft ends up along the vulva, between her legs and not in the partner.
Of course don't forget to use plenty of lube!

With this model you'll need to make sure to keep a good tight squeeze on it or keep your legs relatively close. If you find that's just a hassle for you, you might consider a regular type of strap-on. If you want more info on strap on play, let me know, ok?