The first thing to do is figure out what you are good at and more importantly, what you enjoy doing. You may be able to type extremely fast. Maybe you have excellent negotiation skills. You may be great walking dogs and enjoy the needed exercise. Maybe you have a knack for growing gardens that homeowners in your neighbourhood covet. Tons of people are out there who do not possess the skills you have. You may have a needed skill that can generate a lucrative income in your spare time.
Most of us think of investment income as just the cash flow we get from bank interest, bonds, share dividends and property rents, some of which comes via a super pension.  But a more complete view is to also consider how growing the value of your investments can add to your spending potential.  This total return approach generates income from both income and growth to optimise spending from your portfolio across all market cycles, aligning cheap and expensive investments to your goals.