PRE MIX SOIL OR MIX MY OWN???????

Listen to me...

The promix is just fine.

SCotts has potting soil with no miracle grow. But the promix is fine.

In your veg state, you really only need some nitrogen...bat guano or seabird guano i have found is best....fish ferts....even urine applied to you water will suffice.

Give it jsut enuff to keep green and lush....but not too much. Start slow after a couple of weeks in the grow medium. Not before.

Pee in a gallon of water and feed it that. Really cheap ferts!

Just be gentle whatever you give it...

When flowering, get some shultz cactus ferts or splurg and and some BioBizz or some other fruit vegetable herbal ferts.

Make sure you line the bottom of your container with lava rock and mix some dust in the soil. Great minerals. Great water retention.

Dont need to make it harder than it is. Anything is better than MG for the inexperienced.

Oh and the link you provided was helpful, but this is what you want over there if you go the scotts route, which is a safe one as well:
http://www.scottscanada.ca/index.cfm...ea55e01e3dcb29