Help with Auto Grow

I plan on getting some getting some afghan kush ryder autos for an outdoor. They have a flowering period of 45 - 55 days. I play on vegging outside for around 2 - 3 weeks then planting. What is the best soil to use for seedlings / veg, best soil mix to use for flowering / in the ground, and what are the best nutes for an auto?

I use Humboldt Soil which is nuteless and already has perlite mixed in.....throughout my whole grow. I start appropriate biobizz nutes (organic) at 2-3 weeks.... Your autos will do ok outside if you can avoid pests......

Would it help or hurt to add some Bat guano?