blogger.com is the best place to start your blogging foundation. it is free and it is sure famous. If you would willing to invest a little bit, getting your own domain (.com) and a webhosting for your own blog would be more ideal.
Blog on the topic that you are really interesting with.
Niche blog would do better than a multi topic blog in terms of revenue
If you have lots of idea and lots of content to post, maybe you could create a blog for each topic but remember, it is not easy to manage a few blogs.
never give up. keep trying and testing.
always ask. there is so many guru here who are willing to help