I don't know that anyone can give tips on the shape, since faces are all shaped different and beards will follow due to that and personal taste. For length, use a beard trimmer and set the sides and stash to either a 1 or a 2 guard, then fade the hair on your chin up to a 3 guard.
I use a 1 on the side, 'cause that's how long the hair above my ears is when I cut it. If my hair was cut a little longer, I would use a 2.