how do you pick your first model
Sometimes it can be really hard to choose! Usually I try to pick one that I'm going to use in an upcoming game.
so how do you start painting miniature figures
After I pick which one I want to work on, I start painting it with a black base color to help bring out all the details. 
how well do you do in your first painting
Oh my gosh it was terrible... the miniature was of a female elf wizard, and her face ended up looking like a Picaso painting lol.
Did you learn how to paint miniature or it's just a hobby you develop
It's just a hobby I picked up after learning how to play D&D. It would be really cool if there were classes to teach you how! I've gotten better but I would love to take a class.
Have you check up on some beginners guide online
Oh wow, I never thought to look online for a guide. I bet there are some good instructional videos out there, thanks!
you are welcome, there are soo many miniature painting preparation tutorials online. Good luck