soil, pot size, and repotting?

I'm planning on germinating my seeds next week but I still need to go buy soil and pots. I've decided on using a mix of FF ocean forest and FF light warrior along with some perlite.
If the stores near me don't have either of those I've read that Happy Frog can be used on it's own, so I thought I'd settle for that?

I'll be growing in a 2x2 tent under 250w hid lights and I need to know the best pot size to get and how many times I should repot.
I was going to germinate the seeds in wet paper towels, then put them in small 2 or 4in. seedling pots and after a couple of weeks, move them to 5 gallon pots for the rest of the grow.
I am still deciding between fabric pots or airpots, which would you guys recommend?
I've also read that it's best to plant them into the big pot once they germinate but I feel like FFOF would be too harsh on the seedlings and I see no real harm in moving them just once. Any advice?

Also, when I put the seedlings in the pot, should I add the ocean forest/light warrior mix or the light warrior by itself?

Hey dude, i germinate in paper towel, then into a little pot, then a 1l, then 3l, then 3 gal.
For the little pot and 1L pot I'd use just light compost, then start mixing in the stronger compost in the bigger pots.

You can pot the seed straight into your final pot, but although it's a ball ache potting up allows the plant to grow a better root structure and it's easier to get the watering right in smaller pots