Any class can learn any of the skills, and wear any equipment they have the requirements for. It all depends on your playing style.
differences between classes (minor spoilers) secondary stat calculations
Early Starter Tips (NON-Spoiler Version) (contains much of the information in the above topic).
[color:"orange"]Thing that most impresses me above all however was the absolutely stunning level of interactivity between you and the game world[/color]
That is one of the things what turned me off the Sacred demo. There were all kinds of chests and sacks around, with few of them more than background. While exploring a building, I found 6 candles at the points of a large pentagram, and automatically tried to light them to see if that might just trigger something, without success.