I've been lurking on here for a couple of months now and and I feel Its about time I joined in ie begged for help

After a number of years I have finally persuaded my wife to let me have half of "MY" shed for a model rail layout. This is my first layout and I have been working on it for a couple of months now building baseboards, gathering equipment, and planning the layout. The size is 8ft x 9.5 ft. With a center operating area, (the blue bit in the diagram)
I am now at that stage where I don't know what to do next, theres that many things going on in my head, if you know what I mean!
I have laid out my track design but not permanently fixed it yet. I have built my main models (stations, sheds etc) to make sure everything fits. I now think I am ready to start fixing down the track and put the wiring in place.
My question is: Looking at the rough sketch of my layout below, should I go for a 4 track controller or just a two track controller?? My thoughts on the design were that I would have two trains moving on the twin track loop whilst also being able to control a train in each of the station terminus area and the Loco depot/shunting yard. How easy is it to keep an eye on things and would it be safer going for just two track control?

Any other comments anyone may have on the general design plan would also be appreciated. If I get a favorable response I can also post some photos of my progress in the Personal Layouts section.
Thanks for looking.