If you can't find an AC power cord to fit then you can go with the DC power supply. As for the MM/MC switch, you will still need to use a phono pre amp. The switch only boost the gain from MM level to MC level. If you are using the original MC cartridge that came with the TT, and only have an MM level pre amp you can set your TT to MC and it should work fine. If the cartridge has been replaced with an MM version, then leave it set to MM.
After being in storage for a while you may experiance some problems with the arm wanting to stop in the middle of a track and go back to home position. Clean the track and apply a little sweing machine oil, that should help.
After being in storage for a while you may experiance some problems with the arm wanting to stop in the middle of a track and go back to home position. Clean the track and apply a little sweing machine oil, that should help.