I disagree slightly. It depends on where you are. If you are literally starting out like OP, forget number 2 and 3. Only focus on #1 because if you don't get a few paying customers soon, you will be dead anyway. Focus on surviving first. Forget about 3 years. If you can make it 12 months, you are doing great. Rule #2 is important but not until you have a few paying customers and some product market fit. Rule #3 I would say comes way later. way later.