After having your blog be active and running, you need to promote it in order to get visitors and also traffic. There’re many ways to promote and get traffic, both free methods and paid methods.
Free methods such as: Doing SEO, Social Media Content sharing, Youtube sharing, Facebook Content (Fanpage, Group), Twitter, Google+, Pinterest,…and many other channels that give you free using and promotions
Paid methods such as: Doing SEM such as Google Adwords, GDN, Solo ads, Facebook ads, banner ads,…
Please be shared to you the article about 101 Ways to get more Website Traffic you should know!
So it depends on your budgets that you will choose which methods can give you the best effort, or you need to combine between free & paid methods in order to get the highest effective results
I hope this helps.