Truly amazing.

Right, now we just need to send messages to them. Fastest way i know is using a mirror in space and sending flash morse code Maybe someone if intelligent there can return some flashes of light back to us. Any why light/mirror flashes (think of miltary using flash lights when u need to be silent) well its light it travels fastest we can think of isnt it?

Well you are looking at the problem the wrong way. Visible light is just one part of the electro-magnetic wave spectrum. Other waves like radio waves, heat waves and EM radiation travel at the same speed as light, so it doesn't matter which ones you send.

My understanding of Subspace from TNG and on, is that it is like an extra (spatial) dimension. So, when the ship is with-in a warp bubble, it is actually submerged in the 5th dimension, thus giving the illusion of traveling faster than light.

In real physics, models with extra dimensions have been studied for quite some time and some of them, like the the , have been proposed as an explanation for Dark Energy. Unfortunately, most of these models suck, as they have tons of problems (instabilities, poor agreement with the observations etc).

Regarding warp drive, in the recently (1994) proposed , there is no extra dimension but the whole thing works due to general relativistic effects (contraction of space in front of the ship) thus giving the appearance of FTL motion.