[Em]

Can you draw well with a pencil? Alright good.
Just treat the pencil tool as an actual pencil, and away you go!
For the first couple weeks/months your creations might suck, but after awhile you get a feeling for where to put what.

Just decide on what you want to make and work at it until it looks alright, and then move on to another thing and do the same. In a couple weeks come back to the first thing you made and remake it. You'll be surprised at the improvement.