The following Electronic circuits have been designed with simplicity and reliability in mind.
The circuits will allow you to implement Signalling into your model railway layout.
There are different manufacturers that make boards for block detection, turnout control, and signal display. You will have to choose which ones that you want to use. Here are some web sites out of many available.
As far as the equipment is concerned, both the signals and the electronic boards make it all happen.
Once you pick a company for your parts, you should stay with that company if possible. It will make things easier as you build your signal system.