[Jtsummers]

http://plaintextaccounting.org

And the links from there are a pretty good start. Start with just basic asset tracking (checking, savings) and liability tracking (debt, CC) and get into the routine of it. Then you can add in your investments and other assets (car, home, stocks, foreign currency holdings, etc.). If you don't care about a slightly inaccurate history, just add the stocks later on at their present value, or go back and find your initial purchase dates and cost basis and let ledger calculate your present gain/loss.