Nutrients in

don't buy marijana branded stuff if there are equivalent products that have been on the market for decades. You'll save money and get higher quality products, LOL. thi is not a joke. slap a marijuana leaf on soemthing and ppl lose their goddamn minds. make soem absurd claim that will never be met and they will pay through the nose for it... it's like big dick pills but with plant insecurity :P

Normal chemistry will suffice

I personally use 2fast4buds autoflower feeding chart for advanced nutrients. Haven't tried anything else but i find it good. I recommend that you start with the basic, grow, micro, bloom nutrients and leave the rest for later. Maybe some voodoo juice if you want to spend a little extra. Good luck growing and have fun researching

This largely depends on the brand of nutrients, the type of growing medium, the growing environment, and properties of the water. Please refine your question, and perhaps post it along with a diary so we can see all of the parameters.