I've heard that it is common that breastfed babies don't like rice cereal - because they are used to tasting everything mum eats through the milk, and rice cereal doesn't taste much at all (like formula?). Anyways, rice cereal has very little nutrition, so it might be better to start your baby on fruit and vegetables.
DD preferred to feed herself, so we do Baby Led Weaning. We started, at 6 months, with a whole cooked carrot, a half banana and then potato and sweet potato cut as chunky fries and baked in the oven with some oil. She loves it! Around 8 months we started letting her have chunky strips of meat, for the iron (no, she has no teeth yet, but she gums it, and the iron is in the juices anyways), on a recommendation from the Well Baby nurse.
Good luck!