I'm surprised that the tackle store recommended that you start off with a blade, especially if they knew that you were a beginner throwing lures in the snaggy Cooks river. It will only take a few lost blades in quick succession to turn you off lure fishing.
I advise to use SPs or floating-type/surface hardbodies. SPs are much cheaper (so can risk snagging a few) and these type of hardbodies are less likely to snag if they are not worked along the bottom.
1/16oz jighead with any 1-3" plastic (Gulp Shrimp/Crabby, Squidgie wriggler/lobby/bug, Z-man grubz, Damiki grubs etc.) or a hardbody crankbait (e.g. Berkley fatdogs, Atomic crank38 hardz, Kokoda bats, gladiator kozami or more pricey Jackall Chubbies, Smith Camions, Luckycraft NW Pencils/Sammy, Daiwa Double Clutches) will do. Just use your wits about you when using a hardbody and if in doubt switch to a SP.
Simply wind in the hardbody slowly and it does all the action for you. You can also try twitching it. The learning curve for SPs is steeper but there's plenty on this forum about how to use them.