I get Rapid Rooters at hydro store. If you don't have one near by, you can get them at hydroempire.com for $12 bag of 50.

I'll let someone else answer dwc questions

What is the size of the grow area? That will determine light requirements.
Lighting is 18on/6off (some do 24/0) for seedling & veg, going to 12/12 for flowering.

Pruning can wait a few weeks

Some strains will show sex preflowers within a few days of topping them which I do at approx. 3 weeks. Otherwise, within a few days to a week or so after switching to 12/12

Cloning isn't too difficult - 90%+ success from the first time I ever tried so anyone can do it.

Everyone has their own idea of the best nutrients. Read the threads - there is an incredible amount of knowledge & shared experience right here at your fingertips...everything you need is all here