New grow 2x600 Watt strains: Big Bang + Green-o-matic. Need advice.

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

Since I'm going with autoflowers how many plants can go in a 3x3 area? depends on pot size
What size pots should I use? 3 gallon
What ph levels? depends on grow medium
What EC levels? depends on nutrients
How many times should I feed? water, water, feed
How much should I feed each plant? depends on how old it is and in what stage of growth