
Coteaching is becoming very popular in schools today. You should be lesson planning together, taking part in the instruction, than during independant practice having your students work with you on their lessons. You might be required to modify their work assignments, it would be up to your discretion as their teacher, knowing their individual capabilities.
Depends on the teacher you are assigned to. Sometimes this turns into a great school year, and you will have fun time with another teacher to do all the work. (besides their individual caseloads)
I do not have a coteacher, I just will have the inclusion students again. 6th and 7th science this year.