For a wheel I was rebuilding for my own use I would re-use the spokes in the new hub, and do. Keep track of out-bound vs. in-bound spokes and lace them the same way. The elbows will have been bent differently as the wheel was laced and tensioned the first time and you should try to re-create this in the new wheel rather than re-bending elbows randomly to take the opposite orientation. The elbow is where a fatigued spoke will break. Put a tiny dab of nail polish on the spoke heads of the in-bound spokes before you take the wheel apart. For a front wheel I don't think it matters about left vs. right but if you are taking the trouble, you might as well try to respect that too.