It is not a bad idea to start with a 10 gallon if the bp is a relatively small. It will actually help to provide lots of security to your new snake and ensure he will eat properly for you.

If you do set-up the 10 gallon soon then you will have more time to tinker with everything and get your humidity/temperatures correct. Use the 10 gallon for at least a month, get your bp feeding well and settled in. Then when you have the new enclosure set-up and tweaked, ready to go, you can switch him to that enclosure and give him time to get settled again. It is not a bad idea to keep the bp in that 10 gallon until he has almost outgrown it, since 20 gallons for a juvenile bp can be a bit big (not enough security)

On another note, Welcome to the forum!! If you haven't already, check out the care sheets and refer to them while setting up your enclosure

http://www.ball-pythons.net/forums/f...splay.php?f=62