When it comes to smoothies, the options are basically endless. Start with your choice of milk; cow’s milk, almond milk, soy milk, coconut milk etc.
With that in mind, the first step I would consider is what your goals for a weight lifting program are, and the expected outcome of engaging in that program.
This is at the top of the list for a reason. Anti-Oxidants protect us from oxidative damage caused by free radicals.
If you don't set yourself (realistic) goals, you are basically wandering aimlessly through your fitness journey, wondering what on earth you're doing, right?