Having spent over a decade flying at Mesa, I would advise you to have the aircraft limitations memorized when you finally show up for day one.

Past that, don’t worry too much about everything else until you are actually in class.
Once there, your ground school instructor will let you know what to be working on every night after class.

Just take things day by day- hour by hour if you start to feel overwhelmed.
Training is a marathon- not a sprint.

PM me if you would like to.