If I want to attach a fluorocarbon leader to the end of braided line for the invisibility when fishing in clear waters would I use a swivel or just tie a double uni? I am talking about when texas rigging or some other slow moving tactic. Also I am talking about when I am using a bobber presentation for panfishing.

I just bought an 11″ Diawa Rod w/ a Penn Sargus Reel–50lb PowerPro/250 yards. I want to be able to switch rigs or lures quickly. Should I just tie the braid directly to a swivel, and attach my rigs using snap swivels? Should I have some mono connected to the braid first? Is any kind of “shock leader” required? I’ll be fishing for stripers off the surf. Thanks