Being a new grower, you could perhaps just go with the 3 part system, and run some overdrive for the last 2 weeks, then flush. If you want a complete shopping list, you are asking a very expensive and opinionated question. Perhaps invest in a 1st week bloom enhancer. then a bud/flower enhancer for 4-5 weeks, then some overdrive for a couple weeks. then flush with a flushing agent, than tap water for a week. I have my preferred nutes, but any quality nutrient used CORRECTLY will impress you. I say, keep it simple. If GH 3 part is working well for your veg, keep it per their directions for flower. Maybe add one thing you want to try from their line-up, or a competitor. Keep it simple or you wont figure out which did what. Happy growing to you!