I was in a similar position with a busy work life and home life. As some guys have already said, you need to have some sort of plan to work from. It's not going to happen overnight but it can happen quickly in comparison to offline businesses.
It will mean losing your social life and working at night when you get home from work but it won't be like that forever. There is also a lot to learn and a lot of mistakes to be made. I'm not trying to put you off, I'm just warning you that it will be hard work until you get to a certain level. Then it gets easier.
If you can afford it then focusing on creating a product which will in turn help you build list would be a good medium term target. Good luck.