Some good information is already posted, but below is a short summary:
Everybody needs a lobster card and a gauge. Cards must be filled with exception of catch number before putting net in the water.
Seven legal lobsters are the possession limit. Which means after consumption of the seven, the lobster hooping can commence.
No license required to buy lobster card for pier.
Two nets maximum per lobster card on the pier.
Old style hoop nets are good for landing fish, less than ok for lobster. I can explain later if asked.
Eclipse nets which are cone shaped and collapse for transportation are better for lobster hooping, but not landing fish.
Ambush net which is a welded version of conical nets are great for lobster hooping, but not landing fish. They take more space in the car.
In southern California, no “traps” are allowed for lobster or crab fishing.
For more detail, consult F&W booklet or website.
I learned a lot on this website from others, in particular Dumpha Ben about catching lobsters.