Hey lovey!
With the teets, I the best bet is to probably have a look and buy a couple to test out. My DS likes the Avent ones, (although he's had a bottle all of twice so It migt have been just good luck >< but others I know who are BF like the tommee tippee ones as they are more boob like.
WRT how much... Someone else will hafta answer that one :P I left DS with mum for 3 hours and gave her 500mls of expressed milk because I figure it's better to have too much than not enough! It'll be interesting if anyone knows the "average" amount tho...