A Basic soil base would be:
1/3 EWC, 1/3 Compost, 1/3 Aeration elements ( Perlite, Pumice, Rice Hull). From there, you will need to add minerals. It can be 15% of your own dirty. Thats a very basic soil. Soils are only soils, if there is microbiology life in it. Microbes will do the heavy work...