Yes well you could just get some Medela bottles to begin with for sure. With sterilizing you can just use a microwave vege steamer.

Then down the track you could investigate with other bottles.

I have worked out Pigeon are compatible with Medela, but the problem is they aren't stocked everywhere. That is the reason why Avent are so popular, they are available at supermarkets and Big W, Kmart etc.