Congrats that your DH agreed to HT! That's a big hurdle!
Start at this site by reading everything you can: back posts, blogs, "Gender Methods" at the top of this website. I gathered all the info I needed to approach DH in a "pros" and "cons" list. Pros of PGD: guarantee of gender, Cons of PGD: use w/IVF = expensive, etc.
Then I researched clinics in my area that would do gender selection. I did all of this while pregnant w/DS #2 LOL. 6 months after he was born, we had our consult. Fast forward to the present, our DD is 3 months old.
We did not do MS b/c it was not offered at our clinic and we would have to travel (DH said "no" to travel).
Good luck in your journey!