Need some help here!!!

Listen this is my first grow indoor and my seedlings are about an inch and a half tall after less than a week is this ok? MY lighting is flourescent 100 W bulb around an inch from the plants is this also OK? also how soon should it take till im able to determine sex of the plants? Thanks for all your help. PEACE

as far as i know........ u sex em when u start flowering 12/12 males have balls/sacks females have pistils....... males should show first