On my commuting bike, I run my bell on the left, but only because my IGH thumb shifter is on the right.. Front brake is right lever, the same way that most of my bikes are set up.
On my trike, the bell is on the right. It is there because its design makes it more difficult to use if on the other side. Oh, and front brake is right lever and the left lever is for the front brake.
Just set things up the way you want and go. Change anytime you want.