How much weight per week will I loose if I eat 500 calories per day?

Quite possibly so.

Loose? You mean lose?

Try this instead

Very simple cut portion sizes and walk then you lose and keep it off whereas if you start choosing food you can't eat on a diet, when your "diet" is so called over you gain the weight right back eating what you love.

Not enough to make you look like Eugenia Cooney...