What soil to use autoflower home made grow box, canna terra pro alternate?

Hey Newbiegrower, I am a huge fan of Coir, perlite, worm castings and natural fertilizers. If this is one of your first grows, what I did when I started was use the pro mix peat moss based organic tomato and veg premix that you can find a big box stores. I ran out of coir and my guy is having a hard time getting more in, but my last two grow diaries are using that and they worked out great. you can also find Coir premixed as well, but tends to be a bit more pricey I find. as for ratios I like a 1/5th or 1/6th perlite mixed in. I like a lot of it. about 20% I would avoid anything that is top soil or dirt as they can be difficult to manage indoors even in a controlled environment. m0use