You can use the surf rig on a jetty. It is a fairly long cast to get out beyond the rocks. It also depends upon what you are fishing for. If it is simply casting plugs and metal then the surf rig works or anything down to a 9 foot rod and a reel not much smaller than the surf reel. But if you are fishing in the rocks for blackfish, sea bass, sheepshead and fluke when they are in the rocks feeding on bait schools then a 9 foot heavy action rod with a stronger reel. Actually a conventional rig would work better here since you are not casting that far and you want the muscle.
Baits are clam, crab, strip baits of fish like sea robins and bait fish like killies, mullet, spearing and sand eels.
Fluke, sea bass, stripers, blues want meat. Most will eat clam but fluke not so much. Live killies will catch them all.
Blackfish, sheepshead, sea bass and northern kingfish eat sand fleas, fiddler crab, asian crab, and green crab. They will also eat shrimp and clam.
No problem asking questions. Lots of site members surf fish and fish the jetties.