Many of those lures are also focused on estuary / bass fishing. Buying new in the shop means you can focus on the aspects of spinning which you are most likely to take part in now.
To be honest so long as you have a couple of types of lure (spoon, plug and paddle tail) you should be able to do enough to gain some experience. To start off with I would buy one of each and get out and fish. Then buy a couple more spoons, if you bought a bullet spoon previously get something with a bit more bend in it to be fished slower. Then get a couple more paddle tails, if your first ones were dark then get some bright ones and vice versa. Once you have a couple of spoons in different shapes and different toned paddle tails then get a few different coloured spoons.
Lastly you can get a couple of different shaped and coloured plugs. I think this lure is the one least affected by shape and colour.
