Track Building and add ons

[petestenning]

I think looking at the GPL Repository site Pirenzo is my man for this.
I want to have a go at first at adding things to a track.IE trackside objects but want to know how to do this in simple terms, Yes i am simple too
My intention is to produce a track of my own, this could take years i know.
I am not a young whippersnapper any more so please bear with me.
What would you suggest i start with until i know more about what i am doing.

Thanks in advance.

Pete
PS i have registered with GPL Repository.