A fun style tool is the lookbook. You are probably all familiar with this from the days of cutting pictures out of magazines and pasting them into a notebook. It's a good plan, but the computer age has done us one better.
You can save virtually image onto your hard drive and make your montage on a document, then take a look. Maybe print it, and put your printed pages into your notebook! I am not advocating stealing other people's intellectual property - this is about personal use.
I find several different looks attractive, different moods. But when I start making montages I see that they fall into certain groupings pretty naturally. I have the romantic/natural that forms the backbone of my heartlook, and the chippercute that I find more useful for day to day. (As an example, in my chippercute lookbook, I have several pictures of the wide, highwaisted shorts that were in during the 40s. When I trim down, those will definitely find a place in my wardrobe, probably for gardening. My dresses-mostly wardrobe doesn't extend to activities involving bending over repeatedly).
When you start making lookbooks, you'll start learning a bit more about yourself, and the things that please your eyes. What your heart colors are, what moods please you, etc. It's a great starting place, when you're nailing down your style.
And since we're sharing, this is my first lookbook.