This is the FMCSA paperwork every carrier must hold before you drive. Filling it in now turns orientation into a short day instead of a long one. It takes about fifteen minutes, and you will need your CDL and DOT medical card to hand.
Driver qualification file · 49 CFR 391.21
Three years of history is the federal requirement, so gaps matter — if you were out of work, say so and why. An honest gap is not a problem; an unexplained one is.