First, you must decide what you want to do. If you're not clear on what you want to achieve, how can you set goals? So before you sign up at various sites, set up profiles, and jump right in, you need to make some decisions about what you want to achieve.
Second, you will want to have some clear ideas about how you want to brand your idea. There is no single way to go about this. It will take time and effort to come up with the perfect way to represent your brand. You'll get there, but again, you have to have those goals in mind.
Third, you need to decide on what those goals are. Are you trying to sell something? If the answer is yes, then you'll need to get people to a sales page. Are you interested in growing your business? Then you'll need to increase your contacts. It's important to decide what kind of niche you're dealing with, so that you can set your guidelines around a clear vision of what you want to do online.
Fourth, you will need to set up a blog. Online Business Owners need to have a blog these days. Let me tell you, a blog is really just a website with easy to use software that enables the conversation. You own it, and you can write whatever you want, put images of your products or descriptions of your services on it, and drive people to it.
Fifth, you have to make it worth their while. Give your audience something that they will want to read. And give them reasons to want to come back too. This also means that you should have a good number of high quality articles in place before you tell anyone else about your blog. That way, you're making sure that they have something worth staying around for when they get there.