There's a lot of great information out there if you take the time to research Cat, but you have to be careful because a lot of it just "opinions". After all of the research and what not I've done, I would do everything different next time. Keep it much simpler, focus on plant and not the 8-million and 1 nutrients. They will ALL work (that's what they're meant to do). The thing that's important are the core nutrients for the plant and then a booster or two here and there (study up on the plant physiology, not just people's opinion).
Common sense (well, with a bit of an analytical mind) works. For example, many people recommend "molasses" in the flower period (i.e. sugar which comes in examples such as Advanced Nutrients Bud Candy, etc). If you think about what humans need for energy, carbohydrates or in other words sugars (more importantly , complex sugars), you'll know that any living thing will need that. So, that tells you the advice to use "molasses" is probably good - picking the right one is a headache, but lets be serious, any one will work.
The nutrient companies are not the hippies of the 60's trying to "share the love" and trying to help the various growers out there (some may be, I don't want to talk crap about all of them) They are small (or large) corporate entities interested in money.
Look at the ingredients in various "different" nutrients and you will find that they are simply composed of similar substances. It's overwhelming to someone new, but as Occam's razor theory pointed out (paraphrasing) - among many options, the simplest path is usually the best one.
Anyway, enough rambling, my bad and feel free to post questions if you need any helps. I've gotten a lot of help here and learned a lot and also love to help in general.
ChaoticGood