Hi and welcome.
What you have is a train set from Lionel's MPC days. Lionel was bought by Genral Mills in 1969 IIRC. These were cheap sets, but they ran fairly good, especialy that engine. It is an O27 train set and more than likely runs with an AC transformer, but before you try it look up the engine number. Greenburgs LIonel guide for the MPC years will give you all the info you need. As for track, K-Line makes track exactly like what you have. Another source of track that I like, is MTH's real track. It has a molded on road bed that allows floor running and not carpent lint will get up into the motor. Neat set, enjoy.
Greg Elems