I am not sure there is a simple answer for the first question, but my suggestion is to start with a quality product that comes recommended to you from a good local hydro shop. Start with the Basic/Recommended feed program from one manufacture and after you feel you comfortable with them, slowly (one at a time) branch out from there if wanted. that way you get a quality grow with out 30 bottles of snake oil you just don't know what do.
To the second question herm'd female plants that self pollinate and create seeds only have one set of genes/phenotypes to work with (there own), so 99% of the time the seeds will grow a clone of the mother/parent. But what caused the plant to morph sexes on you? Did you spray it with something specific to stress it into the change, or did it happen naturally on its own? Some plants are prone to such week genetics like Haze and Thai that are bad cannadates for such seed production. Such a plant would most likely always produce heavily herm'd offspring that would never recover. But some stronger plants that are forced into such seed production may only have a few if any unstable tendency's, and could then be breed to remove such weak genes, like the infamous Cinderella Clone-Only cut that was back crossed (herm'd and breed back to it self) 99 times to create C99 a very stable seed form of a Clone.
