Use left mouse click to move and attack. Click on a skill to activate it, some skills require a target which will be indicated by a purple cursor. As you level up skills can be upgraded, look for the red upgrade buttons. Keys: X = toggle camera follow off/on.
Mouse Wheel = scroll up / down.
Space = center view on Minion.
1,2,3 = activate a skill.
Escape = deselect skill, or stop unit.
Enter = open/send chat.