Welcome Javier
I am sure you have a ton of questions You might want to consider the adoption method which has been created for newbies
http://dreamviews.com/forum/viewtopic.php?t=2370

I was lucky. I had beginners luck. Before I could put to much thought into it, I had a lucid dream the very night that someone had told me about them.
As far as explaining what they feel like- I personally cannot explain it well enough to give it justice.