Wow, sounds like you got some work cut out for you. Lets start at the begining.
First off, the engine will have a serial number. The first couple of letters and numbers will tell you what make the engine belongs to. On mine it is TS2504 - xxxxx, hence a TS250. It is also my belief that the last digit will indicate the year, so mine is a 1979.
Second, I am basing my info that the 125 is similar to the 250. You should research the 125 to be sure. The 250 does not have any points, the ignition energy is produced by a PEI (point-less electronic ignition), to which the energy for ignition is produced by the magneto.
With that being said, the coil is located between the PEI and the sparkplug. It has (again on mine, I am not sure if yours will be the same) a white with blue tracer and a black with white tracer going from teh PEI to the coil.
As for all the wires you listed above, are those the wires that are coming off the magneto cause that is what it sounds like. There are simularities between mine and the ones you have listed, but only you can tell. Another good start would be to get a wiring diagram for that bike that way you can be sure you are hooking it up correct. If you have a Suzuki dealer close by, they sometimes have the old service manuals for these bikes. That is where I got mine.
Good luck.