You can get both electric and micro wave sterilisers...we got an electric one as I didn't like the idea of all the microwaves on my babies stuff. You don't NEED one but it does make it easier than boiling everything on the stove. A bottle warmer is optional, we had one and in reality it was just as quick to heat the bottle in a cup/jug with some hot water. As for number of bottles i would say up to a dozen all up....you may find you need to try a few diff types out to see what suits bubs best so don't go all out and buy a whole heap of the one brand. We used Dr. Brown's narrow neck bottles as they have a patented anti colic valve and we never had any problems with reflux but then again we might have just had a good baby...LOL.

Some people prefer the wide neck bottles with the closer to nature teats but our bubba didn't like them so as I said it will be a personal thing once bubs is here as to what they like best...you will need slow flow teats to start with and then as they get bigger you can get medium and fast flow teats, medium from about three months, fast from 6-7 months.

you may want to look at a portable bottle warmer for times when you have to go out and want to heat a bottle....there are a couple of brands that use those gel pads that warm up and heat the bottle (same stuff as they use in those physiotherapy heat pads).....they were one of our best buys. I think the brand is prince lionheart from memory.