There are different ways to get traffic to your blog and the two best ways are search engine traffic and paid traffic. Search engine traffic comes organically from good SEO and search engines crawling your websites. You receive paid traffic from keywords you pay for often pay per click with services like Google Adwords or MSN Adcenter.

Of the two Organic Search Engine Traffic is of course cheaper, but it takes more effort and time to get things going. Paid Traffic on the other hand gets things moving faster allowing you to pay for the terms you want and possibly generate sales and revenue much faster.

Which Way To Get Traffic is Better?
I would combine both methods to get things moving. Use paid traffic to get your website going, and continue to work on organic search engine traffic to save money later.