This site is highly recommended.
These are the folks who showed me the light and helped me write the bottled microbe thread below.
If you are growing outside, I also recommend compost from the land your plants are growing in/on.
This will multiply microbes that are native to the area.
They work best in the local soil.
Also if you grow near the woods, you may need a more fungal mix.
If you are not near the woods a bacterial-based tea is gonna be the ticket.