Terry,
Welcome to the forum and yes you can get any information you need here from start to finish.
I agree with Steve: pick a nice starter / ready to run set from Lionel. Many to choose from. They come complete with an oval of track and transformer. Many people choose the Lion Chief sets which look to be easy to set up and run.
MTH has starter sets too which look pretty good. Either way you can not go wrong.
Run them until you can decide what trains and track type you like. It would be a modest investment back into O Scale.