Hi Liz! If it's motivation you're seeking, you've come to the right place!! 3FC is amazing!!
That's great that you already know a lot about how losing weight actually works. I have found that learning more about what to eat, as opposed to how to exercise, has really helped me. I learned that you can't out-exercise poor eating habits!
So, in order to get started, I'd recommend getting a scale or a measuring tape. Find out what you weigh or what you measure today, and then you can monitor your progress. The scale/tape is really just for accountability's sake
Also, maybe start making some mini-goals? You appear to enjoy exercise goals and you struggle with impulse. Maybe make one fitness mini-goal (ie run 1 mile in x amount of minutes, or do x amount of push ups without stopping?) and then a food related one, such as stay under x amount of calories for 3 days, or dont have x type of food for x number of days?
Just some ideas- you'll see plenty of different ways to lose weight on here and we'll help you find what works best for you!
Welcome and GOOD LUCK! You got this, girl!!
-Sarah