No right wrong answer. I start with just using any preferred brand to feed them in small amount then subsequently change according to what suits them like bottle teats, brand, quantity. I do this when they are few weeks old till present. This is for both mix feed, BM,FM.
Depending on your comfort (some latching mummies will avoid bottle to prevent nipple confusion). I started bottle feeding since the day she came back since I intend to EP and I had to mix feed due to not enough supply. Occasionally latch.