Skis get faster if you wax them a bunch of times when they're new, but if you don't even know if you should wax them at all, you won't notice the difference between 1 wax and 10 waxes.
But yes, wax them 1 time before you ski them. Wax makes skis turn smoother and protects the bases from dirty snow, etc.
Unwaxed skis tend to be grabby and don't turn well.
====================
Welcome back, mommy.