Advice getting into Cryptocurrencies

So I've been looking into possibly buying Cryptocurrencies, such as Bitcoin, Ether, litecoin etc. For those of you that have bought/sold them, how did you go about it and what services did you use? I see in NZ we have a relatively new site call Bitprime which means can trade in NZD using bank transfers, so provides the benefit of being local. However is it better to go through a local or international exchange?