First Mod To First Car Help

Hi Guys,
Recently I bought my first ever car. This being a 2008, 1.3 Litre Suzuki Swift. Currently the car is in a good working order. Having said this, I intend to modify the car to some extent. This first modification being to install after market suspension springs. As I haven't been in the car industry long, finding these parts may be difficult.
Any suggestions on where and how to buy such a modification would be much appreciated.

Thanks
Will
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High and welcome.. Take a look on eBay look for barns stuff tho.. Maybe try potn.com.