Hi Koka, and Welcome to Dreamviews!
Once I lept from the top stair, I knew it was a dream. I didn't get the sensation of flying, but I hovered right above the stairs for such a long time, and the raillings flew beside me faster and faster.
Heh, I had that very same experience in a lucid recently!

Sounds like you got a good foundation in LDing to where you'll be able to pick up more techniques and skills from our forum here.

For extending the time in lucids there's many techniques out there - one popular one is to simply rub your hands while you're dreaming. I always take the time to look at my hands as well - it somehow increases your awareness (probably by giving you a greater sense of "self").

There's plenty of other goodies in the Tutorial's section. Many different spins on the WILD technique which you seem to like best.

I'd also recommend starting a dream journal online here (if you haven't already). That will give you something to look forward to while you're practicing lucid dreaming (and something for us to read!).

Good luck!!