What's in a logbook?

The number of teeth used to cut the lumber.
How many board feet got from each Log
Amount of Jack consumed after felling.

OK, since this going nowhere useful, let the derailment continue:
It's Log, Log, it's big, it's heavy, it's wood.
It's Log, Log, it's better than bad, it's good!

Everybody, sing!

So that begs the question, how do you organize your log book? Do you have event preparation spelled out with all the details? Some of us have never had a log book before.

Y'all are awfully ambitious. We like to keep it simple, and fix stuff when it breaks/explodes/bursts into flames...

I cheated.. I copied a Buddy who's been racing the same Ferrarri Testa Rossa from the 1950's  His log book is organized for him.   I made minor adjustments for mine..
  His Ferrarri has adjustable valves and my Jaguar uses shims..Like Him,  Following each event I make note of valve clearance and since I have the shim used I know not only when it's time to do a valve job but what size shim I will need. Changes valve adjustment from a several hour project to about 30 minutes.. 
  The valve clearance data also tells me when to do a leak down test. I've found that if the clearance closes up by .001 then it's also time to do a leakdown test.  A combination of leakdown data and oil pressure readings tell me when it's time to freshen the engine..
   Now that chassis dyno's are so common I'd be tempted to periodically run it on a chassis dyno to confirm what the other data is telling me..
  MY Jaguar doesn't have a speedometer his  ferrari does.. so he keeps track of miles driven whereas I keep track of time on the track.. If I wanted to I could calculate my lap time and turn it into miles driven but I've got a big enough datat base for hours that it works.
I write down starting chassis specs, what I set for a given track. If it's the first time at the track I look at details of the track  and try to figure out what settings are likely to work best..
All chassis settings are a compromise. so start with the most important corner first..  (usually the one leading onto the main straight). then look at the next most important corner etc..  Based on that you should have a pretty decent idea of what should work..
Never listen to anyone else. Not only will his car be differant handling than yours he's likely a differant driver than you are.  You can however listen to everyone.. If they are all running a lot of camber on the left front chances are you should as well. IF most have the left front pretty vertical that's a decent indicator. 
  Anyway if I make adjustments during the event I write it on a piece of paper and stuff it in the book when I get a chance.. the trick is to write the adjustment down (and the reason) I've found I'm far neater and more organzied after the event than during the event so that's when I enter all that sirt of thing. My buddies wife does data entry for him during the event.  For some reason women seem to love to do that.. it makes them feel like part of the team and if you heap enough praise on them it has other rewards as well.. (grin)
If you always use the same rim and tire then don't bother entering that data repeatedly.  However realize what options you have.. spare tires for example.. what size are they  not only sidewall size but measure them. Measure the circumfrance.  That changes gear ratios.  low profile tires where you want a lpot of acceration, High profile where top speed is more important.. I have 15 inch rims and 16 inch rims. 5.7 tread width
and 5.3 I used to have rain tires but I used them so seldom they got hard and I threw them out..
The next year all it did was rain! 11 of the 13 races I went to were in the rain. 
  It's those countless details about chassis set up that allow you to go to a given race track witha measure of confidense..
Organize it according to what you find important..
If after a couple of years you don't change something then you can leave that entry blank and you will know that doesn't change for you..
Since you'll have differant drivers in the car it's pretty important to keep a record of their times. If everybody else gets 40laps in their shift and  you only manage 38 take a sharp look at yourself.  (or whoever) theres time to gather a lot of information about the car during refueling stops.. measure tread depth, one spot is fine.. tire pressure, amount of fuel amount of oil(if any) added , water added etc..  You're going to be out there racing. so appoint someone to record data during your stint racing and sleeping..

it's good to know you're not overthinking this whole Lemons thing.