If you want to create your blog yourself at Rs 99 then Read How to create a blog
What is Cashback Site?
Cashback site means when anyone purchase a product through cashback sites they give you a cashback to you.
For example: If you buy a mobile phone from Flipkart at Rs 10000 then Flipkart will not give you any cashback to you. But if you buy the same phone from cashback sites like cashkaro.com , pennyful.in etc they wil give you a cashback 1% or 2 %.
What you have to do?
You have to market online shopping sites’s Products (flipkart, Snapdeal & Amazon Products) and publish content of discount and offers in your site.
For Coupon & Cashback Site you have to develop a site from any web develop company. For help you can see cashkro.com (India’s top Coupon & Cashback site).
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How to earn from Cashback & Coupon Business Idea?
You have to join Affiliation Program of these online shopping sites.
Here is the link Snapdeal Affiliation Program , Flipkart Affiliation Program and Amazon Affiliation Program.
Signup their affiliation program and after signin you will get affiliation link of products. Put this affiliation link in your site. whenever a product is sold through your affiliated link you will get a commission from these online shopping sites.
See Flipkart Affiliation Commission rate, Snapdeal Affiliation Commission rate and Amazon Affiliation Commission Rate
For selling products on these marketplaces you have to get VAT Registration.
After that signup in online marketplaces like Flipkart, Snapdeal and Amazon as a seller and upload your products and sell.
Read What Documents Required to register VAT

You can also earn from Youtube Channel. Some Youtuber earn 5-10 lakhs per month.
But for earning such good amount from Youtube, you need to have huge no. of subscribers and videos in your channel. More views in your videos means more earning.
What you have to do?
For earning from Youtube you have to create videos and upload in your Youtube channel. And again share you videos in Social Networking sites. Visitors come to your channel & view your videos.
How to earn from Youtube channel?
Same like blogging again you have to monetize your youtube channel with Google Adsense. When viewers view your videos they view ads and from this ad you will make money.