IFBB Amature Comp Prep first timer

Hello All!
I am 31 years old and I decided to prep for the International Female Body Building Amature contest for 2020. I’m new to this whole diet thing.
I’ve had a fast metabolism my whole life and it is such a change in mindset to actually pay attention to what I’m eating.
What made me do this?
Well, long story short, I got hurt and was out of work for a few months and I joined a gym out of boredom.
Although my arm was injured, the rest of me was fully functional. After 3 months at the gym I was wrapped in a way that would take most about 6 months to a year. I kept being told by members I should try out for Comp, so here I am.
Positive pro-tips welcomed!