If I may put some friendly suggestions to unproven teams (of course I'm not speaking about well known teams in the list):
1. Read the rules, don't be afraid to ask if you do not understand something.
2. Behave on track as it should be done. Respect others but do not be afraid in duels, unexpected maneuvers can be as dangerous as not taking enough attention to other racers on track.
3. Put on solid laps, constant driving is what counts in endurance race. Try not to make mistakes trying to be faster than you can.
4. Starting procedure is very important, I assume you'll be on special watch there. Practice it!
5. I guess there are teams that are not experienced with takeover procedure and pitting. Also practice that one!