The Getting Things Done and Making It All Work books are fantastic manuals for getting started. We also recommend:

Not at all. As a matter of fact, any one little thing that you might start doing, or do more of, could be worth your whole investment of time. We’ve chosen to deliver a complete model of self-consulting and input-processing best practices, which will enable you to use what’s most relevant and have a reference for later when other parts might be more significant.