2nd Year Growing, Still Need Some Tips Please!

What up yins guys.

Ok, this is my first post of the year so let me give you a quick background before I ask my questions. Last year was my first year growing, used just some nugget seeds sound in a sack, and got a total of 17 ounces off 4 plants. Not to bad for a rookie if id say so myself. But now here are my questions/statements.

Could I use the same spot as last year, or would the plants have sucked out all the nutrients last year, granted I will be using fertilizers?

I bought three different nutrients all in powder/rock form-Fox Farm starter fertilizer, all purpose fertilizer, and flowering fertilizer. Also got some flowering hardener for the flowering stage.

How do I mix the fertilizers in with the soil?
Say, should I rake the top of the soil to score the top about 2 inches and just sprinkle the ferts throughout the area.

Should I start using the fertilizer before I have the plants in the ground?

How often should I use the fertilizer?

Should I start off at 1/2 strength then work my way up?

Any help would be great fellas, Im trying to grow some good healthy plants, I have 4 blueberry hashplant seeds i was looking forward to using, but 10 other seeds from california. So give me hand, Thanks!