Stay away from the smudge tool for now
It's really not something you should be using right away, you can tell the difference between beginner and experienced very clearly and I recommend learning the basics and how to do other tags such as using c4ds, textures, etc before even bothering..
Here's a pretty nice smudge tag made by Sane

He's definitely one of the better smudgers on this site
Then I tried the same tutorial, didn't really come close but I guess I played with smudge enough to learn a couple things

It's really not that good but you can see a difference from this and
Beginner smudging

It's how most people start smudging though, generally with a chalk brush, but those just end up looking flat, and not very appealing
gl though and keep it up