Hi Tom, First, I'd like to welcome you to Vyak

Second, Kayaking is considered a dangerous sport, so firstly make sure you practice safety then when you think you've done enough do it again, Listen to what these guys say as they have learnt from experience both good and bad, don't buy just any kayak, buy one that suits your intended use but think about future use possibilities like open water, offshore, surf launches and so on.
Now on to your first question

you intend to fish for bread and butter species, that's easy 1-3kg rod with reel to suit, snapper 3-6kg reel to suit im sure you know all this anyway but the gummy 6-10 or bigger and reel to suit, however this all depends on how you like to fish (play or scull drag) what rods to take well everyone is different on a kayak you are limited by the vessel you have, myself I like to be prepared and always carry far more than I need

mainly in my tackle box and choose from my selection of rods which will be coming as I load my gear, if going for whiting I load 2 or 3 1-3kg setups these also fish for squid on my way out while anchored 2 remain in the water for the whiting/flathead while one always stays rigged for squid, once the whiting come on the bite I usually just use one rod for them as it can get to difficult using 2 but this depends on how they are biting. I always take 1 or 2 3-6kg rods as well as you never know when there is a hot snapper bite until they come, these can also be setup for gummies and other species depending on your setup (amount and types of rods) I like to now carry a casting rod, this is a rod always setup to attach a lure or soft plastic to the end and cast at bust ups.
If im going for gummies then I take the heavier rods as these can be heavy fish, I also take the medium rods for the same reason I take them when fishing for whiting.
Lastly kayaking is a very addictive sport, be careful, I started this hoping to catch a good feed in the bay and now I fish everywhere and just cant get enough
