You've been used to working independently in a lab with other adults I imagine. Teaching will be nothing like this and your sharing knowledge is a small part of it.
Depending which type of school (some hace bettef behaviourthan others), know that it will be all consuming and you will barely have a break.
If you're resilient, patient and prepared to for behaviour management, the same millions of questions about asking for a pen, what's the date, what are we doing when you've made it clear several times, then you will be ok!
It really is a pleasure helping students and so many are lovely, it's the challenging ones who will take up your time and patience.
As for marking, it can never be done within the work day so you need to do this at home and weekends.
If in a school where there is micro management, expect to be observed a lot, books scrutinised and data and class information checked. Yes you will feel like a child.
So much more to say but do seriously think about it. It's never been an easy job but since academy takeover management have become more like businesses. Xx