Hi, Dave, and welcome!
Did you read the book? If not, I highly recommend that you read it before starting.
You can also find great information on the FAQ and in the stickies in this forum. Please feel free to introduce yourself too, so we know more about you!
Regarding smoothies, depending on how you make them, yes you can have them in Phase 1. Do make sure you are getting enough veggies...one with every meal and snack is ideal, but if your idea of a smoothie doesn't include a wedge of broccoli, you might want to double up your veggies at another meal.
There are several great smoothie recipes in our recipe forum. Here's one I like:
1 cup FF
1/4 cup skim milk
1 scoop of protein powder (make sure it does not have anything from the foods to avoid list)
1-2 Tbsp of flavored SF
Syrup (like DaVinci or Torani)
2 Tbsp Flax Seed
Add all ingredients to blender and blend until smooth and thick. Add more ice or milk as needed.