SS - The best advice I could give is to be personable and approachable by the crew. Smile alot and offer praise, especially when it's due. Nothing bolsters a new F/O confidence like telling him he did a s***hot job and that you enjoyed flying with him/her. When making a decision to divert, etc, run it by your F/O for his input and advice. When the F/O is flying let him make decisions, even if it's not how you would do it, along as its safe, legal, and not too embarassing. Let the cabin staff run the cabin with the proviso that the Capt be kept informed. Intervene only if necessary and back the purser up against the wackos and jerks.
In short -- The Captain should never think about "being the boss" and the crew should never forget that he is the boss.