First: what's the difference between leggings, hose and tights? The thickness and foot (with or without)?

I seem to be a slow learner and in my mind leggings are super... on others! Looks so easy and casual and comfy, but I can't figure out how to apply the look to myself. I need your great YLF eyes to help me see what works - if any - and why. Might need some other shoes though, i.e. black ballet flats.
All suggestions and comments are as always highly appreciated!

#1-3 different lengths
#4-6 tights, are these way out? can I wear them as MOTG or should I purge? other suggestions?

ETA: sorry for stained mirror! those small hands are all over (and I'm not), you know

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