I purchased a nutribullet blender years ago. It’s a good size for me to make a single smoothie. A smoothie cookbook came with it that has a lot of recipes. Other recipes I’ve found online. I’ve taken what I like from different ideas to find what I enjoy most. I’ve used protein powders and powered calcium, etc. and blend them right in. There are ‘green’ recipes or fruit recipes for starters. I looked online a lot, it’s a great place to find good options depending on the nutrition you need. I like fruit smoothies best but I try to keep sugar content in mind. Some fruit packs a fair serving of fructose/glucose. I blend in almond milk or vanilla protein drinks plus yogurt, fruit, powders, ice, etc. It’s good to mix it up!
You can check out YouTube, or type ‘smoothie recipes’ into your browser. Amazon’s website has a good selection of cook books, new and used.
Hope this helped!