Not like I can write a giant essay here as a 'crash course'... So this is certainly a Coles Notes version:
Don't wait for your birthday.
If you're just starting out you're gonna mess up - it's part of the learning process...
Start now. Flirt with everything that moves.
The most important thing you can do (after approaching, if things are going well) is escalate. Touch her (not inappropriately)... touch her lots and build comfort. Escalate touching to kissing and so on...
I would recommend searching this forum for 'approach anxiety' and kino... And also read the escalation ladder:
http://www.vindicarlo.com/DiCarlo%20Esc ... lo.com.pdf