T.G.
I usually start by giving the rice cereal in the morning for about a week or two (or once they have the hang of it) and then I start a dinner feeding. Stick with a couple of tablespoons that are pretty watery and gradually thicken up the cereal each day to a normal thickness. Your little one will let you know when she has had enough, don't worry that you have to feed her the entire serving, every feeding will be different. I usually stick with the just the rice cereal for about a month and then I start to introduce veggies first, I have started with sweet potatoes with my three little ones and all have loved them. I give my son cereal and fruit/veggie at the same time, but I don't mix the two together unless he is very fussy. I Introduce one new food every 3-5 days. After two months I start to give them just a fruit or veggie for lunch along.
My kids have all been breastfed, so I am not sure about how much formula to give. I would say let your baby let you know how much she needs. My girls nursed the same amount and my son varies everyday, but he still nurses about 5 times in 24 hours. I do try to give him a bottle while he eats, but he thinks the bottle is a toy.
I hope that helps a little. Enjoy the mess!