Hey, Meryem, I'm thrilled that you found your way over! :)
I understand your eagerness to start as well, so first order either some Lugol's or Iodoral. Lugol's is iodine/iodide in distilled water. Iodoral is Lugol's in tablet form.
If you decide to go with Lugol's, it's available from http://www.jcrows.com
.Excellent, fast service from Mr. Crow. There are less expensive places, but the service from Jcrows is FAST! :) After you've got enough to get started, I would recommend using http://www.clarksonlab.com
to stock up