Welcome. It looks like you already got the hang of it!
When I use macs, I like 8-10" the best, but you will still catch plenty of fish on 12" as well. I hook 'em through the nose when trolling, if I want 'em to go down a bit I shoulder hook them. I use an egg sinker if I want them deeper, or a torpedo sinker for dropper loop. I only use a stinger if I am fishing for buts and getting raked baits.
Trolling speed is just a gentle paddle, but don't stress since you can't go all that fast on a yak, you just want to keep the line tight and go for a nice easy cruise.
Unless I am running low, I always use a whole squid for rock fishing.
You always have a better chance of catching fish with a line in the water. Threshers love the rapala types, but you will usually tail hook them with these. If given the choice, I would rather have a mac in the water and since I never target threshers, I don't use rapalas.
I am not sure if there is a smart card that shows the limits and sizes, but lots of guys make their own.
Best of luck to you!
