1) Uh wow, yeah okay sure! Not like I can stop you anyway mate, but go for it if you like!
2) Nothing I can tell you that nobody else has said in much more elegant ways but, basically, draw everything, all the time. If you can get yourself to some figure drawing lessons that will be incredibly helpful, and reading anatomy books or even just biology dissection manuals like I did is a real foothold for learning to draw humans. I did a little lecture with some basic anatomy tips here a while back but I’m no authority on the matter.
3) OKAY SURE LEMME GET ONTO THAT uh what are wallpaper sizes agaskfsds I don’t even know any more…