Hi I am a TA. Yes I still have paperwork to do, albeit not as much as the teacher. I am involved in planning lessons and helping with the iep's. I have to write reports about how lessons went, what worked well and what didn't, and provide evidence to back this up, this is recorded on paper and electronically. I am observed every term, and have a yearly review. I have to undergo regular training, as in line with our school policy.
My day, along with collegues, does not start at 9 and finish at 3:30, once a week we are expected to be in at 8:30, another day finish later. Training often goes beyond 3:30. On the days we technically finish at 3:30, very rare have we stopped working at this time.
When positions do come up, which, btw are few and far between, and because of cutbacks etc, lots of TA's are being let go, schools can be very picky about who they choose. Competition is very stiff, depending on the area, they can attract a lot of applications. They are very good at weeding out the, I want the job to fit around, and those with a passion. The latter get the interviews.
Find out locally what qualifications they require. Only a few are accepted, even though there are lots of courses out there. The reason why not all are accepted is because some do not require any class based work.
Too volunteer with schools. They generally don't advertise. You have to approach them, leave the details they require and maybe you will get a call.