You should start her off one a day, then 2, eventually over a period of time get to 3x a day. It kind of makes sense to start on veggies, but she's going to end up having her favorites in veggies and fruit. My daughter loved the sweet potatoes.
Start off with cereal, then a veggie or fruit. Probly just feed solids once or twice a day until shes 6mos old, at this stage shes still getting most of her nutrients from formula or bf. My dr also reccomended i wait 3-5 dsys before introducing each new food to watch for any allergy symptoms. Also its good to switch back n forth between green (ex peas) and orange (ex carrots) veggies until fruits come into play. It balences out better nutritionally. Keep in mind too that grain changes, ( going from rice to oatmeal etc) can sometimes cause constipation so doing it gradually can help. Hope this helps lol, it wasnt long ago i was asking a ton of questions about this sort of thing...so much to learn being a ftm!