google "Advanced nutrient calculator", it will tell you exactly how much they say to use...
Start with the 3part, add b-52, and add Bud Candy in flower, you'll love it..
I do it like this...
3x3 table ebb and flow
25 gallon Res,
Veg, (I only change the res after 5-6weeks...(more than one crop))
12oz each of the 3part, (micro,grow,bloom)
6oz of b52
Flowering
First month (changed after 4weeks)
12oz each of 3part
6oz of Big bud
6oz of b52
6oz of bud candy
4-6 weeks,
12oz each of 3part
6oz of b52
6oz of Overdrive
6oz of bud candy
6-8weeks
12oz each of 3part
6oz of B52
6oz of Overdrive
6oz of bud candy
flush with clear Ph'd water 9th week (don't skip)
I haven't seen much with using overdrive, so you could skip it
you can also just flush once a month (if using hydroton) as I haven't seen any salt buildup anywhere to justify a change (even though I do it anyways), however using other soilless mixes like cocofiber could be different...
if you can only afford the 3part, that's ok, as it will still give a great crop... add bud candy and b-52 when you can, as they seem to make a big difference in quality...
