Smoothies can't be all things at once, i.e. greens, fruit, protein, and dairy. Your better off picking two: fruit and veggies; dairy and protein, etc. Spinach is easier when you are first starting, kale can be a bit bitter at first. Dairy is tricky in smoothies with greens, fruit and OJ or water is a better base. Start with more fruit than greens the first few times and slowly change your ratio as your tastes adjust. Green smoothies are delicious but an acquired taste.