Can I earn money from Blogging?


I want to start a blog with subject of bodybuilding, but there is a lot of blogs with that subject. So I’m interested in your opinion should I do it?

On this link it says that you can earn a lot through the blog selling ads and membership, I contacted them and they told me that they can make a blog for me for 90$, which I’ll have to pay 30$ every year, so is it worth investing in something like that? Have any of you had experience with the blog before? How much time will it have to take to actually make money?