no, you should have temporary tags
You can but it's not legal.
Yes
A person can drive on private property in PA without a license. However, in PA driveways and parking lots are considered pubic property.
Did you not test drive it? You should have had it inspected by a mechanic prior to purchase.
Yes
Unfortunately, not unless it is a private road and is located on private property. For instance, if you live on a farm, you can drive a truck on your property at any age without a liscence, but not on public roads. Public roads, even if they are back roads are governed by the state and subject to all of the laws that apply to any other state road.
No you cannot drive at all without a licence. If you drive any motor vehicle without a licence you will have your future licence application denied, probably for several years.
If you buy it from a dealer, you won't leave that lot without insurance on the vehicle. Legally, that vehicle needs to be insured before you drive it on any public roadway, regardless of if you buy from a dealership or a private seller.
No age, since it is illegal to drive on other people's private land without their permission. On the other hand, it is always legal to drive on your own private land, at any age. Age restrictions would only apply on public roads.
who drive a private car
Depends on WHERE you want to drive. In most places, you have to have (or be training for a) license to drive on public roads. But it's usually OK to drive on private property without a license.
No, if you have the owner of the parking lots permission.