That's the hardest part. Keeping your schedule.
Someone way smarter then me once told me:
To be your own boss you have to treat yourself as your worsed employee.
So I need to kick my butt every once in a while.
What I found helps is:
Doing the shitty repeating tasks first, because with those out of the way you have time for the stuff you like doing.
Automate, automate and if you can then automate some more
Specifically for the online ventures goes try to minimise your time building so you can maximise your time promoting.
Well that my
anyway