If you are going to go that route, you need to please remember to buffer your soil and cook it for at least 4 weeks, preferably 8. Without the lime you will have pH issues out the nose and it will kill all your bennies etc. As somebody that wants to try orgfanic growing, I can recommend this as a go-to thread, and GandalfdaGreen is one excellent fella, his results speak for themselves and if ever you are in a pinch or have any questions he will help you out FAST. He's run into every challenge organic can throw at you and dealt with them in spectacular fashion. No elitism on his thread either. Very cool:
https://www.rollitup.org/organics/676040-total-noob-using-teas-i.html
Just compost and perlite... Not too sure about that, it will be VERY hot and that's not really a good thing. If you want to keep it simple, coco seems to be the one to be really open about it.
And 30 USD for good soil is not bad at all, considering the time it takes for it to cook and the many other small variables that can affect your results. If you are making a start as you say, keep it simple I HIGHLY recommend it, get a good, no, GREAT bag of soil, it will serve you very well when cooking your own as you will have a benchmark to compare performance to which will lead to you producing better and better soil mixes...
Apologies for derailing the thread a bit :/