Hello, attractive couple!
Welcome to polyamory.com - I hope you find a lot of useful info here.
Since no one else (except Kevin, >Hi, Kevin!<) has been by to comment, I should probably let you know that what you are looking for (a single bisexual woman to be in a closed relationship with both of you at the same time - aka. a HBB = Hot Bi-Babe) is considered a Unicorn (i.e. a mythical creature that doesn't exist) and therefore you may be labelled as "Unicorn-Hunters". This doesn't mean that what you are seeking is a bad thing, just that it is the form of poly that most people new to the idea tend to seek, and the least likely to end well for anyone.
At some point, someone (it might as well be me) is going to point you to this article:
So, Someone Called You a Unicorn Hunter
Many of us have been there, got the T-shirt, learned our lesson - and then went on to have other healthy poly relationships.
TL

R - Dating the same person at the same time does NOT minimize jealousy. Date separately. Bi-women will have more success in this than straight men (Sorry!).
JaneQ
(PS. If you were in my area and 10 years older, I would volunteer to be your unicorn just so you could practice with your training wheels on someone who won't be devastated when it doesn't work out!)