Got a 2001 Olds Aurora for my sons first car.3.5L V6

Has a hard start issue..

Crank it 15-20 times and no start.
let it sit 15 minutes and it will fire up..
Runs a little rough and then smooths right out.

Thinking maybe the pump???????????

This is the newest car I've worked on...LOL

Welcome to the forums Dan!
Do you have a check engine light on ? Or any stored codes?
Try unplugging the MAF sensor & see if starts Link: Oldsmobile 3.5L V6 Engine Sensor Locations Picture
Generally it is best to do a full tune up from spark plugs to fuel & air filter etc..
A fuel pressure gauge attached to the schrader valve on the fuel rail will give you the psi.