I am a fan of starting with a sampler. That way you can learn the techniques and build expertise from block to block. To this day, some of the easiest patterns (4-patch, 9-patch) are my favorites, even if I have advanced out of newbie status. I also eliminated a few patterns that looked real pretty on the picture but turned me off during the process.
Making a sample block to proof a new pattern is generally a good idea. Not all pattern documentation is created equal and neither are all seam allowances.
Asking questions is a BIGGY. Rather than struggling with an intricate pattern that JUST WON'T BEHAVE, ask someone. This board is AMAZING!!! for help and answers. I was lucky in that I have a colleague who can translate my brain-flubs into pictures. I am a visual learner and she has drawn many verbal instructions into a picture. All over sudden, the steps made sense.