How to create or add bus wires to small layout?

[RobertInOntario]

I have a small N scale layout that is about 3’ wide by 6’ long. It consists basically of two loops with sidings. However, I have only one set of wires going to one of its loops from my transformer and two sets going to the other loop. As a result, the layout often has problems with not enough current reaching all of its sections. To get around this, I keep having to re-solder track joints.
To solve this, can anyone point me to a book or website where I can get clear instructions & diagrams of how to connect several bus wires to the various loops? I've seen a few online but some look complicated. 
Wiring is not my specialty so I want to keep it simple, plus, it’s only a small layout. Do I need, for example, a small wiring hub that various bus wires from the track would connect into?

Thanks in advance, Rob