How much to eat
The Whole 30 program doesn't suggest weighing or keeping track of food (journal), but instead relying on your body to tell you when you've eaten enough. If you're eating healthy, and it may take a while to adjust, you should be able to tell when to stop eating at meal times (don't snack between meals). You won't get the mixed signals you did when you ate refined carbs (processed food) and it's unlikely you will sit in front of the television munching on a head of lettuce or a pound of carrots!
The Whole 30 plan suggests putting meat on the plate first (one or two palm sizes of protein) then filling the plate with veggies (go to downloads/shopping list to see what vegetables are suggested)