That Schultz potting soil is about the same as the MG potting soil. I have used both.

No nutes, the first 3 weeks or so. Lightly, water. Also, it's helps to flush the soil well, before planting the seeds or transplanting later. (allow to drain completely, add perlite 20%) IMO.

Watch for the roots growing out the bottom of the pots, then transplant. Good luck with your grow. Enjoy.