Bicycle Mechanics - A couple of questions for a bike build

I'm a little confused as to how to continue with a few things, so please help!

1) I'm building up a Spicer track frame. It uses a one inch threadless fork, and I've pretty much got it all on, except I'm not sure which way the shim for the Nashbar stem I bought goes on. It's shaped like a T and I'm confused as to which side the flattened part should face? The Top or the bottom of the stem?

2) What's the best way to route a brake cable on a TT bar? FYI: the cable runs on the exterior, in the interior.

3) I have a Shimano 105 dual pivot brake, and I'm stumped as to how to properly install it. What's throwing me off is that "quick release lever" thingy-ma-jiggy.

I apologize if my questions sound a bit silly. But I want to be sure I do this right. Thank you.

1) if you are using a 1" top cap you should have the lip of the shim on top. If you put the lip of the shim under the stem then you'll need to use a 1 1/8 top cap.

2)Are you talking about running the cable housing above or below the top tube? I generally run my housing under the top tube to give the bike a cleaner look.

3) there is a ton of info on this subject but in short, the lever should be pointed down when you set the brake up. when you flip it up the brake opens a bit to allow for easier wheel removal.

If there's no groove or holes for the cable housing to fit into on the handlebars then I like to run them on the lower side where my palms and fingers won't ride on the ridge left by them.

On the calipers the "normal" position for the lever is pointed down. You flip them up to let the pads open further. So put them in the down position and pinch the arms in then pull on the cable then release and tighten the cable pinch. That usually leaves just enough slack that the pads lift away about the right amount when I release them. Adjust with the cable adjuster for fine tuning from there.

Thanks a lot! I've got everything done now!