Want to get excellent at sales (even if you're going to stay with FT employment)? Read and re-read: Socratic Sales.
A lot of people believe that start-ups succeed or fail because of cash (enough or too little). Certainly cash flow is king when it comes to staying in business. However, the reality is: You either have time or you have money. It takes time to develop a clientèle through carefully crafted product fulfillment and good service. Or you can accelerate this process through expensive advertising. You can burn through a lot of cash if you solve everything with it. Or you can be more creative and leverage time, including other people's time, and spend from less to zero. Time and persistence can pay big dividends.
So, hone your skills. Sell them. Watch your cash. Develop relationships (clients vs customers). Bank!