I think the first thing you should realize is this - you are feeling exactly like 95% of all the other students that will be in your class!
Try not to worry about formatting- this is something, like other have said, that you can easily accomplish. Graduate school is all about becoming an independent thinker, synthesizing materials, and learning how to convey your opinions/thoughts in a professional manner.
Readings: There will be a lot...and you will be expected to do more than 'just' read. You will have to really understand and think beyond the page....criticize the work, think about the benefits, limitations, and future directions...I even brought in additional papers for my classes (the students hated me, but for me, it was connecting ideas and expanding my understanding of the topic)...try not to look at just the readings week by week, but try and connect them, and bring that into class.
Class: My classes were very much like seminars in the fact that they were mostly discussion base. At first, it will be intimidating to speak up and talk...but force yourself, and you will find it comes easier and easier. Don't worry about questions you have, or if you think your ideas are off...I always think it's important to show that you think outside the box, and can support your opinions. Also, I think it's important to sometimes question what you're given...not every professor will give you readings that they think are the gold standard- some will want to challenge you and how you think
Seminars: My seminars were student presentations and discussions. It's hard not to feel intimidated and nervous during these periods (we all do), but look at it as a learning experience in a friendly environment. Engage and participate- the more you do, the more comfortable you will become. Take opportunities to get feedback on your work from your peers- and collaborate! This is what the experience is all about!
Coursework: I would recommend always meeting with your professor to discuss your final research paper. I don't know about your department/field..but often times, professors will look at drafts and give feedback. Take that opportunity to get the feedback and advice, so you can know exactly what they expect. Also, hook up with other students...peer feedback is great- but reviewing others work is a great opportunity for you to learn and will help your own writing.
Overall: remember that you're just heading into grad school..you're not expected to know everything! this is a learning experience! be open, and take every opportunity to engage with your peers and professors. Don't be afraid to speak- remember, 99% of the people there want you to be successful! They don't want you to crash and burn- so think of it as a friendly environment!
Don't be scared- be excited! it's common to be nervous, but try and think about how amazing, rich, and fun it will be
Made my day.