2x600watt Grow. Strains= Biga Bang + Green-o-matic. Need Advice

Starting a new grow 2 x 600 watt.
Growing area= 3' x 6'
Strains= Big Bang + Green-o-Matic (both autoflower)
Nutrients= Canna tera
Medium= Canna Professional Plus soil

Questions:
Since I'm going with autoflowers how many plants can go in a 3x3 area?
What size pots should I use?
What ph levels?
What EC levels?
How many times should I feed?
How much should I feed each plant?

Any help would be appreciated. Thanks in advance.

Hello i dont have any advice just wondering hows yours went as im about to start the same. any advice that you have learned?

Nothing yet. Changed up the grow. Going with 4 x 600watt lights in a 8' x 8' grow room. Will be growing 27 Vanilla Kush clones I got from a friend in 5 gallon pots in soil. 9 under each light. Also have 7 green o matic's in 3 gallon pots and 3 G13's and 3 canalope's in 2 liter pots. The Green o matics, G13s and Canalopes were germinated from seed and are almost 3 weeks old. The vanilla kush have been vegging for almost 3 weeks and are going into flowering in 4 days.

In general how many times should I water and feed a week?
I am watering every other day and everything is going good. I haven't fed them anything yet, don't want to burn them like I did my first grow but want to feed them during flowering.

Any advice would be highly appreciated. Thanks in advance.

Yo wus up well i just show ur post n im thinkin u should gave ur lil.girlz some nutes if ur med dont have any !!!!
N allwayz try too water with pure ph water atleast onces every other week or sooner!! Goodluck n happy grown boss!!!

Advice for you: don't love your plants too much, she's just a weed...she'll grow, with just a little bit of help from you (and your HID lights!!!)

The med is BioBizz light mix. They said don't feed for the first 2-3 weeks cause the medium has enough nutes.
Got some pics if anyone can help me out. Some of Vanilla Kush got a lot of little yellow spots on them. Most are OK and looking really good.

Anybody know whats the cause?

Some pics of the Green o matics, G13s and Canalope. The green o matics are in the bigger pots.

Also anybody can give me or recommend a watering and feeding schedule? I got Biobizz butes and Canna nutes.

Thanks in advance.

Anybody???