Hmm, my post disappeared! Maybe it was because I'd included a link? (though it was just to Abrazo's inquiry form page)
In any case, welcome! The first step in terms of paperwork would be to fill out Abrazo's inquiry form and send that in, if you haven't already done so.
It can be tricky specifying gender, since ultrasounds can be wrong (happened to my second cousin this year). But if you are willing to wait for a situation to come up in which a child has already been born - or for an older child - than you could request that.
The forums are full of different people's experiences - Have fun reading!