If I could go back 10 years to my school/college time, I would try as many startup ideas as possible. The luxury of time at your disposal is a HUGE advantage.
For me personally, two main things. Absolute unwavering conviction in the vision, and the discipline of consistently solving every little issue that arises to keep the project growing faster. Discipline also gets you in a creative zone that has the potential of taking your project at a higher level at anytime.