You should always host a blog on your own domain. You can get wordpress for free, and it's the best. It's always better to build your own website rather than building up a site like blogspot. Other than that, it looks really good. I just recommend you host it yourself if you want to make money over the long haul.
its better you buy domain and it will be looks more profesional. but anyway overall i like your site. good luck to you.
Design is not visually stimulating at all. But the worst part is the content. I assume English readers are your intended audience, but no one is going to take you seriously when they see all the typos and poor writing and grammar on your site. I suggest you invest in a professional content provider.