Without training wheels

If you'd like to teach a kid to ride a bike, training wheels are a bad idea. You're much better off with a small bike with no pedals. 

All training wheels do is confuse, distract or stall.

The same thing is true for marketing. You don't need to go to school for four years. You need to do marketing. Find a worthy charity and do a promotional event to raise money for them (you don't even need to ask first). Start a micro business. Sell things on eBay.

And the same thing is true for leadership. Find something worth doing, find others to join in. 

Merely begin.