Soil Ratio

First time doing an indoor grow and was wondering the preferred soil ratio when transplanting my seedling plugs into the 5 gallon fabric pots.. And will I Beijing the 2 or stacking them? That8ght be a dB question but I just want to be 100%..
Using Foxfarm Ocean Forrest and California Super Soil for 3 Gorilla Glue spuds.

Thanks in advance.