I have a 1972 TC125 with the dual range 4 speed. Yours will have the 5 speed standard tranmission. EBay is full of manuals and parts for these. Just in a few weeks I was able to buy NOS cables, lights, fenders, wiring harness, grips, tools, pegs, and emblems. Reproduction Decals up in Canada made the factory tank decals to original specs. These were all purchased at reasonable prices. You'll find it's a whole lot easier to work on than the CB650. I've ridden it and it's perfect for new riders and wives who want to try learning.
Mine is in storage waiting it's turn at restoration. The 1st order of business is to strip it, powdercoat the black parts, chrome the shiney pieces, replace the rubber ones, lace new spokes to new rims, add period tires, disassemble/reassemble the engine and transmission with new seals, gaskets, hone the bore and replace the rings, hand the paint over to someone who paints, then play jigsaw putting it all back together.