I'm going into the middle school high school building next year, a it going to be as hard as i think it will be?

Not at all , if you're not used to that type of school then the only thing that should be on you're mind ,should be giving your best ,and  putting lots of effort in school . If you're scared or having anxiety over it then just remember that you're awesome no matter what !, "you are definitely smarter than you think and  stronger than you seem ".
I wish you the best ! 

They usually separate middle school and high school.  So you will be doing the work of whatever grade your in.  If you get bullied than just go to a teacher, or stand up for your self most likely you will not get bullied considering that there are lots of kids at the school your going to.

Honestly isn't the place to ask that. search it up on google or something. that's the best answer i can give you.