Good SOIL AND NUTRIMENT

hi i would like to know what should my soil contain to get nice fat weed ! consider i am starting 12/12 from seed , or maybe gonna go for a week under 18/6 thanks in advance !
AND WHAT NPK SHOULD MY NUTRIMENTS CONTAIN I THOUGH 20-20-20 or 6-2-4 FOR VEG AND 15-30-15, or 5-15-10 FOR FLOWERING

i mix my own soil using parts of peat moss, potting soil, bonemeal, bloodmeal, perlite and garden lime for ph control.