I'm new to this forum and everything and I hope to make some new friends and such. I have some questions about not only lucid dreaming but dreams in general.

1.)What is the best technique to do when wanting a lucid dream?
2.)When I wake up from a lucid dream, is it possible to go back to sleep and pick up right where I left off in the dream?
3.)When in a lucid dream, do I start off in a scenario or do I have to create it on my own?
4.)Can I change my appearance and structure when having a lucid dream? Because I'm hoping to try to look like Kratos from God of War.
5.)This one DOES NOT have to do with lucid dreaming, and should probably go into my dream journals but this dream happened years ago when I was around 6 or 8.

I'm being dropped off at my elementary school, and I walked up to my friends in the playground before the school bell rang. This day was a few days before summer vacation and the temperature was in the high 90's to the 100's. We went inside, perspiring from the heat, and I looked outside the window and noticed a bush that caught on fire, solely from the hot summer day. I called over my classmates and we all just stood at the window, watching the bush burn. The teacher didn't even tell us to sit down, she just stared at it with us. I'm wondering if a burning bush symbolizes anything, or if this was some sort of premonition.