Thinking about incorporating shrugs into my routine....

A few questions:

1. When is a good day to do them? Think I may do them on shoulder day, but not sure.

2. Dumbell as opposed to barbell? Is there anything I need to watch out for in particular? Is the motion just shrugging my shoulders? (I need to go watch the video again.) These will be for standing shrugs.

3. What is a good weight to start out at? (Front raises are currently done at 10 lbs., just to give you an idea of relative benchmarks.)