My advice is to visit other blogs that are getting traffic (you can tell by how many comments are left on those blogs) and start a conversation on there. Read what that blogger has written and ask questions about it. You will get other people to notice you and offer their opinions. It is better to ask questions than it is to simply offer an opinion. By asking questions you engage people. You get them involved in your conversation and entice them to speak back to you.
Do this a bunch of times at the same blogs all the time. It helps immensely if those blogs have the same general audience of readers that you are trying to attract. Then begin to branch out doing the same things at other blogs until you develop an audience at your own blog. Once you have an audience at your own blog, you can just reserve your comments for the most valuable blogs in your niche instead of spreading yourself thin.
In order to keep people coming back to your blog though, you have got to speak directly to them as if you were having a conversation with one other person (that reader and that reader alone.) When you write as if you are speaking to one person, you cause them to pay attention to what you are saying. If done exceptionally well, you can sort of hypnotise them. That is what the really good bloggers do. You don't even realize that it is happening.
You will also need to decide who your audience is going to be. Figure that out early in the new blogging stages. That way you can focus on writing posts that speak directly to them. Do not try to broaden your audience too much or some of them will lose interest in you. It is better to have a smaller number of addicted readers than it is to have a whole bunch of people who are wishy washy over what you say. Be opinionated.
Link out to other people's blog posts whom you admire and respect. Do it liberally. Link out wherever appropriate to do so. Do nice things for other bloggers without ever expecting them to return the favor. Reciporcity is a hard thing for decent people to ignore. If you are nice to them and are always doing nice things for them, they will feel obligated (sooner or later) to return that generousity. They will reciprocate. When that starts happening, your blog will really take off.
Don't give up until that happens. It will take months. If you are brand new to blogging it will take many months (more than six). I have written dozens of blogs. The fastest I ever got one to really take off was about four months. After four months I was getting dozens of super high quality comments on every post that I wrote. I only published one post per week (not every day as most people suggest.) People were leaving exceptionally high quality comments that proved they were totally engaged in what I was saying. (I am not saying this to boast. I am certainly not the worlds best blogger. I am saying it because it is what I have learned from my own personal experience.)
--One more thing -- If you really want to develop an audience quickly, be sure to ask the reader's opinion at the end of every single blog post. I have used this tactic in some of my blogs. It really works wonders. That is, if you want those comments. If you don't want comments, then don't ask.