Save everything you do not need to spend. Don't just throw it in a bank savings either, invest.
Invest your capitol in something reliable that you know and trust. This investment earns you money dividends. Reinvest theses dividends.
The key is not to touch the savings until you are ready to. The hard part is saving it to begin with. it takes serious discipline to save your money, but if you manage it correctly, it pays off in magnitudes!