Hi Wader63 and welcome aboard!
1. In answer to your first question regarding line weight when setting up your Canterbury Lure Rod. The main consideration is to spool your reel with a heavy monofilament line that is sufficiently heavy, and thick in diameter, so that it doesn’t cut into your hands. Lure rod fishing requires that you run your line through your hands constantly while fishing. The last thing you want is needless line cuts. Most anglers use 40 – 60 lb mono. It sounds silly spooling with such heavy line but protecting your hands is the idea behind it.
2. My lure rod reels are spooled with some cheap line I bought at The Warehouse. It works for me.
3. I use either 15 or 20 monofilament traces. These can be up to 2m in length when fishing a lure rod. I keep mine a bit shorter having one about 1.5m and the other 1.2m. I use Maxima for the traces.
4. Flurocarbon leader material sounds like a good idea when the rivers are very low and clear for fishing size 6 lures. I don’t know anyone who uses Flurocarbon traces when fishing the lure rod.
5. Using a string of 4 or 5 lighter barrel leads to make up the required weight is way better than fishing a single heavy banana lead. With the “daisy-chain” of leads you get fewer snags and the whole rig seems to cast better. This is very much a personal preference as there are top anglers who fish both forms of lead weight. Also quite popular nowadays for lure rod fishing is a single lead weight hanging from a split-ring. The leads are made by chopping in half various size banana sinkers. This rig is surprisingly good at not snagging on the bottom. It is quicker and easier to make than a daisy-chain. It is quick to change weights with a pair of split-ring pliers – well worth a try!
6. I always use a swivel at either end.
The biggest problem most beginners (and many experienced) anglers find when fishing the lure rod with two traces is the constant tangling of the two traces together. Always untangle the two before casting again because if a knot forms in the trace it will break-off at that point when you get a good fish on. Some guys are very good and get hardly any tangles. But even the best anglers still get some.
Another thing that happens in crowded situations is that anglers pick up another’s gear causing awful tangles. The answer, aside from moving, is to have fresh rigs all tied up and ready to tie on quickly and so keep fishing. More on Canterbury Lure Rod traces https://fishingmag.co.nz/Searun-Trout-Double-Hook-Rig.htm. Good Luck!