Some will, see the related link for a compatibility chart.
Yes, it will fit. However, you will still need to see if the lens you have has or does not have features like autofocus or CPU connectors that will carry all the info that your camera needs... If it is a Nikon Lens it will work fine. So will others like Sigma, Tamron and Tokina. Carl Zeiss may not give you all the functions but will work in manual mode.
Yes
Yes
I think so
Yes, if it is an f mount.
D300s used to be higher end at its release but now D7000 offers superior image quality, ergonomics and faster handling in a lighter and robust package. D300s is a bit tougher built and heavier.
Yes, pre AI lenses may cause damage though
ED has nothing to do with the camera mount; it is a lens (glass) quality so yes, it will fit
the current nikon speedlight range is thus: SB-200 SB-600 SB-800 SB-900 All will work with the Nikon D300s Older speedlights will also work, but without i-ttl mode.
Yes, it will fit
No the Choice TV Mount 53 can not accomodate a 60 inch television.
It has an 11 mm dovetail mount so any 11 mm scope mount will fit