R,L,C...the links wouldn't work. I assume the meters have the accuracy required for the measures. Read the manual very closely for zero correction.
Line Z: this is simply determined by Z = sqr(L/C). For video, use a test frequency as high as possible.
This method works better than fancy shmancy TDR stuff at home.
Dielectric constant: Not gonna be easy by any means, for non coaxial wires.
For a pure coax, with a braid shield (not spiral) and a non spiral core, use the relation:
L time C = 1034 times DC. L in nH per foot, C in pf per foot.
Edit: Brian, note that this equation is actually a "double braid" equation, where the inner conductor is a hollow conductor to mitigate it's internal inductance...so, does not consider the internal inductance of the center wire. This will be applicable for solid conductors at rather high frequencies, though.
If you measure the inductance of a typical coax, you have to subtract 15 nH per foot from the measurement in order to use the LC product equation.
If the center wire has a relative permeability greater than 1, that 15 nH will be multiplied by that relative permeability. {end of edit}
Prop velocity = 1/sqr(L times C) (fraction of lightspeed is the result..)
Attenuation measurement of a foot of wire will not be accurate enough. Use a long run.
Ummm, why is Briansmith banned?
Cheers, John