Hello from South Korea!

Until now, I've had a mexican black kingsnake for about a year, and a ball python for about 3 months.
However, I wanted to get a bigger and rewarding snake for myself.
I started to do some research for getting a blood python, and frequently looked up in this site for info.
Now that I've gotten her(or him) about 3 weeks, I decided to join in.
But I do still have some questions left unanswered for myself.

1. How am I supposed to know the sex of my blood python?
2. Am I using an appropriate sized enclosure?
3. Will my blood python turn red after some aging?

P.S. How do I upload pics on this site? I'll add pics when someone tells me how