Corns and balls are great starting breeding projects.

I wouldn't recommend boas right at first because a female red tail can drop 50 or more babies at a time! Boas are livebearers as well, so you don't have eggs to count and prepare for before they are born like with a corn or ball.

I'm starting my breeding projects with my normal and albino stripe california kings. My dumerils boa could drop some babies too.