If you car has ISO plugs, you just need to buy the female ISO connector with tails, then fit spade connectors to plug into your radio. The four sets of connections along the top are for the speakers. Trial and error moving the balance and fader around with one speaker connected at a time will sort out which is which. The two larger spades at the bottom are a +ve and -ve. That's it.
I suspect that the small spade at the bottom is a power out for an electric aerial, but I'm not 100% sure.