Overwhelmed by info options on Flt Computer

I'll take Folken's "start simple" input, great advice, another step.
One option to avoid being overwhelmed is to fly early XCs with a paper chart and an audio vario, maybe even with speed to fly. With more experience, you'll have a better idea of what YOU want to see displayed in the cockpit.
Early XC is perhaps not the best time to be figuring out a new flight computer.
Jim