How many cups/ounces of veggie smoothies should i have for optimum health every day? any veggie must haves?

No data: There are no scientific data on this subject, and if anyone tries to tell you otherwise, they're probably pulling your leg. It sounds like your diet is already healthy if you're drinking veggie smoothies, so you don't need to worry too much about quantity or which vegetable to use. Aim for a healthy, varied diet, and then stop thinking about it.