Need Help Building Up my Road Frame & Fork

Hi all.  I'm building up my "new to me" frame a fork - a 2007 Specialized S-Works Tarmac (Gerolsteiner colors - beautiful!!).  I'm running into some problems in my build, and I'm hoping y'all can help me out.  Here are a couple questions that I need some help with.

1) My fork is completely hollow.  Normally, on my tri bike and other bikes, taking off the headset cap allows me to see a small apparatus inside the top of the fork post that the headset cap screw locks in to.  On this bike, the fork post has nothing inside.  What do I put inside the fork post for the headset cap screw to lock on to?  What's the piece called, and where can I buy it?

2) I'm parting out some other bikes and am importing an FSA carbon crank.  It's a Superlight Octolink crankset (year unknown) with a 53/39 setup that I would really like to keep, but the axle is too large/wide.  The current axle is a hollow axle (which I'd like to stay with, as it's a touch lighter) and has splines (8?) that the crank arms lock on to.  The axle is a bit too wide for my bottom bracket and won't let my front derailleur line up properly.  To make it work, I need an axle that will work with the crank but is 68mm.  Where do I find the proper size axle that will work with this specific crank?  Does it have to come straight from FSA?

3) Last year, I bought a nice torque wrench from PBK.  It came with some pretty standard size attachments, and I'm excited to use it.  But I have no idea what I'm doing.  The gauge on the side of the tool shows numbers - 3, 5, 7, 9, etc. - and the dial on the bottom moves in increments of 0.4 - 0.4, 0.8, 1.2, 1.6, 2 (which lands you on the next number on the gauge).  How do these numbers correlate with the torque settings for my bike.  For example, the front derailleur setting is recommended to be 44 in-lbf (5.0 N-m).  How do I set that on my torque wrench?  Do I turn the dial so that the gauge shows 5?  Any other ideas on how to use my wrench?

I'm sure I'll have more questions, and I'll post them as I come up with them.  Any help you can provide will be greatly appreciated!!

-Joel