As I wrote in this post - I've opened a commissions. I advise you to read PRICE - TOS.
But if you are lazy - I can answer all your questions in the comments.

And the most important thing in a nutshell:
•4 slots available (deadline for each slot is 4 to 7 days (except for particularly complex commissions)
• via boosty/hipolink
• 50% in advance, 50% on approval of sketch