for what its worth.
swivel definately at the top of the leader between fireline and leader using palomar (cant beat it). This keeps the Hardware away from the beast. Length of leader largely dependent on casting method but assuming your not pendulum casting from land than I have to assume a reasonably short leader of about 30-40 inches. shorter will cast longer. Terminal end is debateable but I have caught more fish on direct tie on to lure using correct knot that allows for lure swing than I have with various clips at that end. If I use a clip I DO NOT add another barrel swivel. My belief is one is enough and less hardware means fewer spooked fish. The opposite POV is that in the heat of things you want to be able to quick change lures and not continually shorten the leader each time you clip and tie on a new lure.
swivel definately at the top of the leader between fireline and leader using palomar (cant beat it). This keeps the Hardware away from the beast. Length of leader largely dependent on casting method but assuming your not pendulum casting from land than I have to assume a reasonably short leader of about 30-40 inches. shorter will cast longer. Terminal end is debateable but I have caught more fish on direct tie on to lure using correct knot that allows for lure swing than I have with various clips at that end. If I use a clip I DO NOT add another barrel swivel. My belief is one is enough and less hardware means fewer spooked fish. The opposite POV is that in the heat of things you want to be able to quick change lures and not continually shorten the leader each time you clip and tie on a new lure.