Any more than one plant per pot, and the roots will start battling for supremacy. All will suffer.

You'll also need nutes. Veg nutes for vegging, bloom nutes for flowering. Also, may want to get some Superthrive, or some other form on micronutes. With Miracle Grow Soils, I've found better results when adding extra perlite to the mix.

The better care you give, and the more chances you give yourself to learn...the better your chances of success. What kind of results do you expect, when only doing the minimum?