Yeah I agree find something you will enjoy doing.
But also think about the other benefits you want from your own business. I know a lot of people dedicate their lives to making their own business successful and that might be too much for some.
Personally I want a good balance, so I can take time off to do what I enjoy - traveling, surfing, sleeping in.. Whatever. That to me is the best part of having my own business.
If you've got the free time now, I 'd consider just learning as much as you can about operating a business, marketing, web design,
seo, etc etc, anything you think could be useful for running a business. If you've got the internet at work, well it's all in there for you already. If you have the time to build up your own skill levels, you'll probably find you can do most of the things yourself and start off quickly and effectively.
Good luck.
Mike