Vans under 10,001 pounds are not regulated by the federal government, so you don't need a CDL to operate one commercially; however, some carriers haul Hazmat on vans so under these circumstances you'll need a hazmat endorsement on a CDL.
No Log Books unless carrying 1000 pound, of hazmat, including container.
We're told the NY state and AL require vans to log, but I've had no problem with this.
No HOS for non-hazmat van; however, many carriers impose a milage limit on van operators in order to comply with spirit of the HOS regulations. It's the safe thing to do.