How to Set Up Habits and Start Getting in New Habits

Once habits are developed, there's less will power needed to make yourself do things. Having a plan is the second layer after learning how to set up habits and start getting in new habits. So what we call implementation intentions, which are if this happens, I will do this. And having just backup plans for any big catastrophe that might happen,. Like how will I stay as close to on track towards my goal as possible?