Signals - Which and where?

[stephanh]

Hello,

as some of you may have read in my other thread, I am planning to build an N scale switching layout.
Theme is the modern BNSF in an Illinois located industrial district.
But the layout should be usable as a part of a branch- or maybe mainline, too.
Especially the left and the upper leg.
The lower left to lower right area will be staging only.
I would like to build it some kinda prototypical and I am now asking myself, if there have to be RR signals.
I´m not very experienced with signals and I´d like to know which signals should be placed where on the layout.
Attached, you find a sketch of the track plan and I´m looking forward to any advice you guys can give.

Regards