Soil in nutrients for auto flowering plants?

I am getting ready to start growing auto flowering low riders! What's soil do you recommend? And what fertilizer should I use do I need a veg fertilizer or can I go straight to a flowering fertilizer? Your advice would be very helpful!

Thanks

I mix my own soil but use about 1/3 MG organic w/ perlite,vermulite,peat,lime and about 1/3 old soil from last grow that has been flushed well.I only use fish emissions in 1st watering befor planting.the 1st 3-4 weeks get water only until sex shows then a mild dose of organic bloom fert 1-2 times and flush for the last week.
most important is to get the seedlings into DEEP (12-16 in)contMHainers ASAP. >IMHO, it seems they throw a root down until it bottoms out & that affects final hight of plant.