I took the course youre describing last year. As far as the quizzes are concerned, if you gave them hard quizzes, it might make them study more in the beginning, but in the end, I know of friends/people who just didn't come to recitation because of their lower quiz scores. Think about it this way, they figure that they're doing badly on the quizzes, so what's the point of going and wasting 1 hr of their time, when they can be sleeping/eating/drinking/whatever.
If you give easy quizzes, it might boost their morale, but you won't be able to get them to learn most often.
My TA last year (in 2006) was excellent. He was very friendly... remember to SMILE! That helps a lot, it can sort of comfort your studets. Talk with them, laugh, but get down to business as well. Also, if I were you, I'd just tell them that you're available any time, if they need help. It shows them that you care, but I garuntee you that hardly anyone will come anyway. Also, you should do tons of examples, it seems like that's the way to go in that class. What he did was briefly went over the topics (2-5 min), then did problems. Also waht might help, if ou're really devoted is to provde a quick summary sheet for each chapter, of the basic topics/theories/equations. It might help them for the test.
Anyway, good luck, it'l be fun.