Depending on what you used to eat, your first Blast may not be the tastiest thing for you. For example if you are really used to sweet foods, the vegetable Blast can be bitter. I like to start with the classics. Try these recipes: https://nutriliving.com/recipes/a-classic-nutriblast
If the recipes are gritty, it sounds like you are not blending long enough. Try to blend for at least 45 seconds.