<human>:  What should I know before I start a 529 plan for my children's college savings?
<bot>: Before you start a 529 plan for your children's college savings, you should know the details of the plan, such as the performance of the investments, the fees and expenses, the tax benefits, and the terms of withdrawals and changing investments. You should also research the different types of 529 plans to determine which one is right for you. Additionally, you should have a plan for how much you plan to contribute and when, and you should be familiar with the rules and regulations related to 529 plans.