Welcome Robert,
Probally the most important part of this hobby is to have fun.
A starter set is good for you to get into the hobby, but sometimes sets don't come with track or transformers in O gauge trains(Williams does that).
Since you have both MTH and Williams trains, I suggest using MTH or Bachmann/Williams transformers for now.
I have a DCS unit with both the handheld remote and TIU(track interface unit) and the(AIU) accessory unit from MTH. Command control is nice but can get expensive when trying to run both TMCC & DCS together.
Run two differant tracks and use one for conventional running and the other for command control, see which you like best.
I happen to like the old style tubular track that Lionel used for many years before Fastrac. Be careful with buying track, as there are many styles and brand names of track for sale in O gauge.
Before adding on to your layout find out what track you like and use it.
I like to use Gargraves track for my O gauge trains; Lionel and Williams, however I find that I need to use O gauge tubular track for my MTH steam engines.
Lee F.
