Hi all! First time Mom question.

I've recently decided to bottle feed at 38 weeks pregnant and I'm trying to learn what to do and how. I'm using Avent bottles, but my friend told me to use ether anti-colic or natural nipples and not to alternate between the two. Is this true? Does it really matter? Also any other bottle feeding advice would be appreciated. I'm very nervous bc this is my first child and I've been preparing to breast feed and now can't due to some personal health issues.