Hey Steve, Yes mix your nutes first and in order. Grow, micro, bloom. Additives are just that don't count them in your tds. Mine could get as high as 2000 in full bloom with additives.. As for formula's, there are many. If it's your first folow the directions or look in the faq's section on GH 3 part and stage of growth. I use the lucas formula and see no difference with or with out the add ons. Some may be good I have not tried them all.

Let us know what you used and how it goes. It helps others that ask the same questions.. What strain are you growing ? Different strains do better with more or less. Someone may help you that has the same or has grown the same. Good luck. Peace.