Research should be listed under...research...(am I missing something here?). Several of these activities could probably go under multiple sections-maybe what you were getting at is that you "volunteered in a lab." I would suggest putting the category that fits the activity most specifically.
For ongoing activities: put the anticipated end date, it doesn't have to be exact. If you're doing it up to med school then put August, 2013.
FYI I used this a lot when I did my primary and it helped for questions:
https://www.aamc.org/students/download/182162/data/amcas_instruction_manual.pdf
AMCAS also has surprisingly great customer service (IMO) so feel free to call them too if there's something you're really not sure about.