Hey, Welcome to DreamViews!

Losing Control, or not having complete control is normal for beginners like us, so don't worry about it, as it will improve with practice.
Vividness will also increase as you get better at remembering dreams. Dreams seem less vivid because of how well you remember them.
To help with this, make sure you keep a dream journal, to record all your dreams.

I would also recommend starting a thread in the intro class, or having a look around the forum to expand your knowledge of lucid dreaming!
Apart from that, start with small goals when lucid, like touching the surroundings and experimenting with reality checks.
This helps stabilize the dream, and helps convince yourself you are dreaming.

Hope this helped a bit, if I didn't explain clearly, drop me a message.
Good Luck!