It's pretty much the same for trans guys as it is for cis (non trans) guys. Cis guys can have any sexual orientation under the sun, and trans guys can too.

Before transition I dated guys, and then for a while, identified as a lesbian. Now that I've transitioned, I haven't dated anyone (guess I'm just not ready) but I identify as bisexual. I'm attracted to both sexes, but am more attracted to women.