how to earn through blogs

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i have recently created my blog in the www.blog.co.in and having posts in it .but i cant upload a file in to the post ,can any one please say me how to upload a file in the post and i want to earn money through the blog, can you explain me clearly how to earn through google adcence or any other advertiseing system which make me earn more and how to keep those adds in my blog and how to get huge traffic to my blog.i also created a domain in www.110mb.com and also cant understand how to upload files to it and keep adds in them can any one please quide me so that i ll thank a lot for helping me .