Need some Advise!

I usually do a 1to 1 ratio. I would add earth worm castings to the soil too. Also look up coot's living soil. He has a recipe and it's water only fully organic. I'm currently using that in my Bruce banner grow. Her name is budsy Holly if you like to check out how the soil is affecting the grow.

If your going coco and perlite it’s 70% coco 30% perlite. I grow only with coco and perlite and i find its easier to work with. Example: if you have lockout it’s easy to flush and fix the issue. As stated from someone else coco you will need to add nutes after transplanted as well you will need cal mag through out your grow..

Soil / Perlite / Coir : I mix @ 70/10/20 Too much coir will retain water a bit too long IME. Opening you up to all sorts of nasty rot down term. My 2 cents. Look up some nutrient schedules on line and copy some basics; they'll have tables of what you'll need. Adjust to your needs as you go. I use FoxFarm liquid concentrates with great success. Good luck!

Never take grow advice from stoners.