Here's a thread you may be of interest to you.
http://www.officialforum.com/thread/15147
On rules stuff:
1) Know the kicking game rules real well including PSK
2) Be in tip-top shape especially this time of year when the humidity is high
3) Buy extra bean bags - you'll need them for PSK
4) Know force and the momentum rule
5) Know Pass interferece rules - when restrictions start and end for each team.
Some others out there may have some better ideas but the ones listed above from a rules perspective come to mind.
From a mechanics perspective I won't comment to much about that because I haven't worked this position. I will say get hold of the officials manual as there's a section about reading and understanding keys between you and the L & LJ.
Good luck.