Dawww - not tag for poor ole' blue! ^_^
Well, i suppose i'll have to do
I can help!! I'd pot up into just the soil ... leave that slow release "mystery mix" in the box lol .. you don't know when or how it's gonna get released and could burn your auto really easy.
There'll be enough nutes in the soil for another 10 days at least - which will give you time to look into some NPK based feed you can mix in with your water.
(down the line you may want to try a living soil (organic) or biotabs which are like easymode organics)
Dont water that 3 gallon pot to run off yet
it will never dry and you'll want to encourage your roots to search for water.
I use a small plastic cup from seeding to about day 10 .. gradually giving more each day.
Sometimes i'll do another small water in a ring around the outside of the pot (to help to soil not completely dry out) ... but don't water log it.
At about day 30 (about 1 feet+ tall) - you'll be able to water to run off every watering.
Question 2: Absolutely ..yes and regularly. Especially when it comes to training of any variety. For HST you could go a few shades darker!