It's not a one time thing. You need to carve out small biweekly or monthly investments, that you feed over the long haul. Always pay yourself first. Rich Dad 101 ... First step before all this. Write down all money out and money in weekly. Analyze your cash flow. See what you can cut in terms of the outbound piece. If you don't *need* (as opposed to want) it, then don't buy it until after you have paid yourself, and paid your bills. Doing what I have described over many years will, if not make you rich, at least vastly increase your net worth.
You're preaching to the choir - I pay cash for everything, and I mean everything. You find out you don't need LOTS of stuff that way!