Do I need to ground my above ground pool / with saltwater system?
You need to BOND the pool structure and any equipment (motors, etc) or metal parts associated with the water circulation system. You also need to bond the water itself. Ground rods are NOT required other than for a sub-panel (if installed outside the house).

Pools are quite complicated as far as the electrical requirements go. IMO this is NOT a DIY job and should really be done by a professional electrician experienced in this kind of work.