The phrase "to make a plan" means to create a detailed outline of the steps you will take to accomplish something.
Sentences with «to make a plan»
Don't make plans for anything that will take longer than 40 minutes and leave within an hour and a half. (eflirtexpert.com)
Students might not have the education or life experience to actually comprehend how credit works, and typically don't make a plan for repayment. (westgeest.com)
Don't let angry feelings get in the way of making plans with your partner. (divorcebusting.com)