There is a page documenting Advanced User Interactions; which has a lot of great examples on how to generate a sequence of actions, you can find it here
// Configure the action
Actions builder = new Actions(driver);
builder.keyDown(Keys.CONTROL)
.click(someElement)
.click(someOtherElement)
.keyUp(Keys.CONTROL);
// Then get the action:
Action selectMultiple = builder.build();
// And execute it:
selectMultiple.perform();
or
Actions builder = new Actions(driver);
Action dragAndDrop = builder.clickAndHold(someElement)
.moveToElement(otherElement)
.release(otherElement)
.build();
dragAndDrop.perform();