Primordia/pre-flowers will first appear at the junction of the leaf/branch where it meets the main stem. Look for white pistils/hairs.
If it is not an auto, you will have to change the lighting cycle to 12/12 to start the flowering phase.
Also, ease up on the nutrients, your plant is super, super green and this much nitrogen can mess with the plants systems.
Hope this helps, Organoman.