i need help!

[ilovemysnake]

ok so i have a baby black rat snake who i absolutely adore. next week my fiance and i are thinking about getting a leucistic texas rat snake.
what i want to know.

1. humidity level.
2. temp.
3. 20 gallon good?
3. can they breed?
4. temperment.
5. how big will he get?
6. is he gonna be ok without substrate? i have a green liner thats easy to lean.
7. how do i introduce my snakes?
8. know any care sheets for them?
9. what exactly is "bug eyed"