NSI (I did a 1 day course and it jump started my career)
CND (3 day course,it covered the all the basics) Their chemist here,Doug Schoon published a book, Nail Structure and Product Chemistry, a must have book for all.
OPI (A cruise little bit of this, little bit of that, and they gave tons of one-on-one/John Hauk is a walking miracle, and cute too)
Young nails Few hours with Greg Salo/ last class was an 8 hour gel enhancement you will get your $ worth) Kupa/Vicki Peters lots of days/hours, lots of everything nails including proper e-file education.
I excluded a few "brand names"
All have excellent education.
If I were starting out as a new nail tech I would hook up with an established nail tech. A trained, well rounded mentor. He/She has years, technique, and a clientle in their hands.
During my years, I have met many folks that talk the talk, but when it gets down to the nitty gritty, their full clientle consisit of 2-3 clients a day 1-2 days a week. You need someone that is established, but wanting to get out in to the field of education.
Do your research, you are on an excellent path posting on The Nail Geek.
Good, luck, this is a fantasic career move.