What do you want to achieve?
The first and most important step is to set a goal or ask yourself what do you want to achieve with your training plan. Run a 5K? Run a marathon? Run faster? Run longer? Maintain your current fitness level? The possibilities are endless. This step sets the tone for you entire training plan and is completely up to you.
Research
Once you know what you want achieve, now it's time to do your research. There's countless of workouts and exercises out there. Figure out what workouts you need to do to reach your goal. You can also ask someone who has done what you want to do before and find out what worked and didn't work for them. Obviously everyone's journey is different but they will most likely have valuable insights that could help you.
Create a list of small goals to help you reach your bigger goal
When you're in the middle of any type of project or plan, it's easy to get distracted and loose focus. Setting small goals or milestones and celebrating them is a good way to help keep you motivated. Process over perfection.
Create a balance schedule
As we said earlier your plan is going to vary based off of what you want to achieve but any good training plan balances hard days, easy day, and rest days. Keep in mind there might be days when you hit a roadblock or just don't feel like working out, we've all been there. Be flexible and create a backup strategy for days like this. It's always good to prepared.