I'm new to all this and wonder how it helps you to get into a lucid dream?

I know ofc you will use it to see if you are in a dream but I mean how is it useful to become lucid.

If you do rc with watches, will it in a dream realize it's blurry and then get lucid?

And how does dream journal help?

And how should I react in my first lucid dream?

Just need some better understanding for this so I can get better result.