Apple, Carrot & Orange Breakfast Smoothie (Eat This) is a German recipe, right-click to translate. This gives you many of your recommended servings a day, and carrots make the smoothie naturally sweet.
You don’t need a Vitamix blender (a few hundred pounds) to make smoothies. But do invest in a good one (say £50) from a kitchen shop with a glass lid and good motor, that won’t burn out after a few uses. If you find a blender that’s easy to use and easy to clean, it’s less likely to gather dust in the cupboard.