Focus, focus, focus.
Focus is the key to startup success. You have fewer resources than established companies. Your only path to success is to focus those limited resources in a tightly-defined problem space, so that your concentrated effort burns the hapless ant of success.
Easier said than done, right? I have a very simple system to maintain my focus. It should work for you as well.
1) Flip over one of your business cards.
2) Write down your three biggest priorities, in phrases of three words or less.
3) Stick the business card in a place you'll see it every time you look up from your computer screen.
4) Any time you catch yourself wondering what to do, look at that business card.
If you do this, you'll end up doing something every day towards each of your three big priorities, which is the first step to success.
So much of what we accomplish in this world depends on the slow accumulation of progress. Often, success can't be rushed. So make sure you're making steady progress.