Buy the best soil quality potting mix you can afford. You can't grow prime plants in cheap shit dirt!
Besides, the soil is usually the cheapest part of any grow.
Autos need 18/6 light/dark to grow properly and if you are growing outdoors, go with photoperiod plants, they will be far superior to any stupid auto flowering plant. And yes, I am an enemy of auto flowers in general and after many disappointments, stopped growing them due to their poor yields and unstable genetics.
For a comprehensive article about container growing with soil, try the "Mandala Seeds" website and on their home page click on "grow guide" and you will find a mountain of information relevant to all cannabis strains and with recommendations for particular brands available in North America and Europe.
As I said, it is highly informative and a great source of ideas and information for all new growers and far more detailed than any 20 line answers you may get through this forum.
Hope this helps,.........
Organoman.