Need help with weights!

I'm heading to the gym on Tuesday with my best friend. My intention now is to tone up so after reading things on here, I want to start lifting/weight training. But I'm at a loss. I have NO idea what to do. Most of my exercise is cardio (running, yoga, walking the dog, etc) and haven't been to a gym in years.

Where do I even start with weights?? Any advice is greatly appreciated!

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