After having your blog running, you need to promote your site in order to get traffic and revenue also. There’re many ways to promote, for both free methods and paid methods.
Free methods such as: Doing SEO, Social Media Content sharing, Youtube Sharing, Facebook Content, G+, 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,…
So it depend on your budgets that you will choose which methods that can give you the best effort, or you need to combine between free & paid methods in order to get the effective results.
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I hope this helps.