I add a "bunch" of perlite. that is laymans terms. like 30 percent of soil should be perlite. add vermiculite to make soil light and airy but moist too. nice
home depot has kellog organic soil and compost for 7 dollars for 3 cubic feet.
steer manure is everywhere rightnow for 70 cents. . Also I stay away from peat. Also coca coir is a good additive so is vermiculite.
dont forget your azomite or greensand or dolomite.