Do you mean you don't know what true means? Seem odd you would be buying carbon wheels if that's the case. The answer is that it means that as the wheel turns around it wavers back and forth between 1/32 and 1/16 inch. I would assume that is on each side but there's no way to tell. There's also no way to tell if the wheel is that far out of true and also has uneven spoke tension, so there's no way to tell how stable the wheel would be. As noted above it's fairly easy to true a wheel in general, but I would ask why the seller has not done so, and if you don't know what truing is you have some learning to do.

As for performance, that is far more dependent on you than on the wheel.