I know the meat is supposed to be the size of a deck of cards but how much veggies?

Depends where you live.

In Australia 1/2 of a small/side plate is the usual recommendation.

Given the size of a deck of cards for meat, I usually try to restrict myself to no more than !/2 cup of veggies.

Yep, if we're only supposed to be eating a cup-ish total for everything, then I try to make 1/2 or 2/3 of that a protein, and then the rest veggies.

When physically putting in a cup to measure do you chop the food up first?

I was never really told to measure my food and generally have always eaten a bit more than a cup per meal. I just take a small bread plate and put small portion of meat, veggie and starch and eat in that order until I am satisfied. In the beginning it took a little trial and error but eventually I got to the point where I knew how much I can handle today. In my program, we gauged portions by the scale and being satisfied. You make sure you get all your nutrition, serve it up in small portions, chew well/eat slowly and stop when you are full. If the scale does not show results then you get an adjustment.

3 oz of meat is the size of a deck of cards or a bar of soap. I may have eaten that much meat some days during my weight loss but usually not quite. I probably eat about 1/2 cup of fruit and/or veggies and 1/4-1/2 cup of starch.

I eat 3 half cup meals and many eat more. I guess it really depends on if you are counting calories and what you eat. I just measure my meals eat healthy and don't count calories just my protein. It will fall into place as you journey on.