Hi dreamer_numero_uno, welcome to DV!!!
As far as being able to do things in your dream once you become lucid, well, you will get the chance to practice them. It's fun and (usually) not hard to learn things like flying in your dreams.
As far as the vividness of lucid dreams, well, they vary. I have had lucids that seemed more real than anything I had ever experienced in real life... everything was cleared, more crisp, and more vivid than it could ever be in my waking state. Most of the dreams for me however (lucid or non-lucid), are of regular vividness... that is, they seem as real as everything you're experiencing right now. Sight, touch, smell, hearing... tasting.
I will go ahead and say what anyone else would say to a fellow dreamer, the best advice: Start a dream journal. You will find that it will quickly and greatly improve your dream recall, as well as help you find some recurring dream signs that you may have.
Good luck on your journey! Feel free to PM me if you have any questions...
EDIT: here's the link for the
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