Delegate
Even if you are just starting up, this is one of the most important lessons. You need to learn how to delegate.
Since the company is your life and you want to care for it, you will start adding more and more responsibilities to your plate. Before you know it, instead of working on your vision you will end up reading contracts, writing proposals, doing accounting, answering phones, paying bills etc. At the end, you'll be very unhappy since you won't be doing what you love.
Instead, find people that are better than you in all these jobs and that actually love doing it. Delegate the tasks to them, step out of their way and focus on growing the company and developing the vision.
We all have a limited amount of time in the day and we need to spend the productive part doing what we love. Stop doing the tasks that you hate and delegate them to people that love doing them.