[KararCBB]

This should give you a really good idea for what you are trying to do and read the comments: http://thenextweb.com/apps/2013/08/16/best-blogging-services...

It will be hard to get visibility with free services and if you are serious then buy a WP Theme (my favorite site is www.prophoto.com it is for photographers but you can tweak a lot and give it a professional look). Yes, adding social sharing features and specially having comments section a must, we wouldn't have been talking if HN didn't provide us this feature, right? I would also suggest that you submit your posts to techcrunch.com www.themuse.com and see if you can contribute in their blogs and get your name out there and then go on your own, good luck!