I can help with a few of these:
3.) I would definitely suggest stainless steel brake lines, my go-to is Goodridge. There is a noticeable difference over stock. You can get them here:
http://www.jdpmotorsports.com/goodri...-zl1-gdr-12227
It would also be a good idea to upgrade your pads while you're in there. This is only if you are going to be tracking it more than driving on the street. I went with G-Loc pads:
https://www.jpssonline.com/p-58-2014...-by-g-loc.aspx
5.) This is done only on new pads, after they are bedded then they are good to go. After that, all you will have to do each track session is warm them up.
6.) Those two screws should be plenty, I haven't seen anyone have problems with them. Soon Ill install one of my own in my car as these stock pedals are way too thin!
7.) I've found this sub forum to be the best, I also check out the track/autocross and ZL1 forums.
Hope this helps!