It might involve putting appropriate wills in place to protect your family, thinking about how your family will manage without your income should you fall ill or die prematurely, spending money differently, but it involves thinking about all of these things together i.e. your 'plan'. You can build a plan on your own, or if your needs are more complex you might want the help of a Financial Planner.
Start by working out your goals in life, in the short, medium and long term. Prioritise them, and think about the likely cost of those goals and when you will need the money, so you can start to plan your finances to work out how to achieve them. Don’t forget you also have to plan for some of the hurdles you may have to overcome too. It’s about getting organised; being in control of your finances rather than letting your finances control you.