First thing would be to get yourself an
ejuice calculator found here for the one I use.
eJuice Me Up - Best eJuice Calculator
You would enter in the information needed. For example, you want to put in your Nic base and strength, then you enter the target nic strength you want and how many mls you want to make like 10 ml or 30 ml ect. You then type in the percentages of the flavoring that you want. I suggest to start low as it is easier to add flavor than it is to take out. I personally like to use 3% or lower on flavoring as taste is subjective. A simple recipe for your flavors now would be like 3% blue Raspberry and 1% cotton candy.Then at the bottom of the calculator you will see the area to enter in your final ratio that you want like 30 pg and 70 vg or 50/50, or what ever you want to make. Then click on calculate. It will When mixing in the concentrates, I would suggest 1 syringe or dropper per flavor as you do not want to cross contaminate same as for Nic base, PG, and VG. The calculator will tell you how many mls. of each flavor, PG, VG, and Nic base to put into your bottle. You should not need to dilute them. Hope this helps. Any other questions just let us know. Oh, and +1 on above post reads. Study them and take lots of Notes!!!