Misfire cylinder 6

[smay01Boxster S]

I have 01 Boxster S, Cel code P306, misfire cylinder 6.
Should I replace the coil pack? or move it to another cylinder and see if I get the code for that misfire?
should I repace the spark plugs? all orignaly I believe, 79,000miles.
Should I replace the spark plugs tubes as well?
will I cause more damage if I drive with the misfire?
any help would be much appreciated.
thx
Scott