I am not recommending these themes, but if you watch
THESE VIDEOS, you will get a good idea of how wordpress works. Very easy ..... once you know what you are doing. But it does so much depending on the theme you purchase.
I suggest you download FIREBUG and use it to view websites so you can get used to seeing the styles being used on sites and play with it so you can see how you can customize the styles to suit your needs. Some folks would have you believe you install wp, install your theme and away you go...sorry...not that easy..if you want a good site.
I have used alot of different themes. The Coherence one is nice, But one I found I like so much better is called Striking.
Available through ThemeForest. The thing that seals the deal with me on this theme..it does so much...but more importantly is the outstanding support the fellows provide. There are only 3 of them but they do yeoman's duty is helping their buyers. I have been beta testing the new Striking Responsive and it is great. It does soooo much. It should be coming out very soon. Anyone who buys the current Striking theme, will get a Free upgrade to the responsive one when it is ready. How many companies would do that? None that I know of. They would charge you as if you were buying a new theme.
Read and watch videos. BEFORE you start doing anything. Another good source for training our these
YouTube Videos. They do a good job..