Hey APG,
I am also new to officiating in the Houston area and this is what I have found so far. You need to join the local chapter (11-01-21 Harris County) and the state org
www.TASO.org . You can join both thru the local chapter. You need to go to camp in the off season. This chapter recommends the following:
www.westsideref.com ;
www.camptexas.us/ ; texas officiating basketball clinic. There are classes from now thru June that I know of. I will send you a contact number offline. Good luck!