It's great you are aware of your procrastination. We are all affected to some degree. The trick is planning ahead, even before you start your own platform. Once you have some articles - start by posting one at the time.
Another way is breaking a long article to several posts. Good content doesn't have to be heavy or long - is should be right to the point. Linking those posts each other and using the same tags will create continuity.
A blog is a conversation with your followers, so gradually you will be able to focus on subjects.