I caution you to be aware that you will stumble across many plateaus in your training.  Some days things that were once easy will be very difficult to perform and it is natural.

Do not dance so much with the mirror but inside yourself.  LEave your teacher/instructor be your eyes.  (personally, I hate the mirror).

In regard to flexiblity and turnout.  Take it slowly.  I have been the victim of 1 torn hamstrings and 1 very irritated sciatic nerve running down the back of the opposite leg and it isnt fun.  Injuries happen, you dont need to force them to happen.  Funny thing is I have more body problems with dancing than with any "organized" sport I ever played and it is probably due to pushing your body consistantly to the limits of both flexibility and strength therefore any weakpoints definitely show through.

Turnout is both natural and genetic.  You are destined to have a certain turnout after the age of 12.  You may be able to get a few more degrees of it over time, but some dancer may never get perfect 180 degree turnout.  Barishnokov is a dancer who's turnout was never 180 and he is a famous dancer.

To open the muscles you need to find a good instructor who will coach you on ways to warm up your rotator muscles and other muscles deep in your leg.  These once warm and full of blood yield better to stretching and control.  Similar to your ankles.  Try to do 12 revolutions conter clockwise slow, then 12 clockwise, then another set of 12/12 faster working though the full flex and point of your foot, then another 12/12 on the same foot making 36 revolutions each direction each side.  This will B_U_R_N and is a sign that you are getting blood to the ankle.  This will really help your plie and fondu as the area will be very warm.

As a young dancer (and as many do) you need to find ways to warm and lengthen your body before class.  IT allows you to center, find your core muscles and stretch.  If you ever watch older dancers who still dance and dont necessarily teach others, you will find they take great  care in investigating their bodies prior to any barre exercises.

For your turnout, your teacher can show you where the limits of your natural turnout are.  Just remember you do not want to stretch ligaments.  IF you streat a ligament you might as well sit on the bench as ligaments never "unstretch" without an operation.  Be cautious to only 'lengthen' muscles not necessarily stretch them.

With ballet you will find there are many dynamics.  A pulling up as you sink into a plie, a compression as you try to lengthen your atttitudes, and so on.  In my opinion, these dynamics are part of what makes an interesting dancer.

Finally Dont rush your training  IT takes years of work unless you are a natural talent.

Some other good turnout stretches are from Yoga, specifically the frog.  There are also good warm up exercises to open them up which you may need to ask your instructor to show you.