There really are no guidelines, just start feeding her. If she is breastfeeding, the other food is just for practice, really, so you should just relax and not worry about how much of whatever. Babies are amazing at knowing how much they want to eat. If she wants more, feed her more. The other good thing about self-feeding, is that it takes longer to eat the food than when they are being spoon fed purees so she'll easily let you know when she's had enough.
Start with bananas or avocados or some soft veggies like zucchini. Very quickly you will find (I think) that your daughter will figure out how not to choke. I think my daughter gagged once (their gag reflex is triggered closer to the front of the mouth than adults, I believe), then she realized what was going on and she has been happily eating ever since. I never did purees and started her self-feeding at 10 mos.
She is now 18 mos and eats most things but we started with fruits and veggies and introduced grains, dairy and meat more recently. I personally wanted to wait on the white foods-bread, crackers, pasta, Os, etc because I see a lot of kids who only eat that stuff and I wanted her to be used to eating more real food (at least until the 2 yo pickiness starts!).
Finger foods are so much easier and before long she will be able to eat whatever you are eating. One of my DD's favorites still is sweet potato "fries." I cut the sw pot into fries or chunks, combine with olive oil and bake. Nutritious and easy to self feed (also good to take when eating out). Legumes are also good, small lentils, black beans, etc. Cauliflower, broccoli, carrots, peas. All are easy. Once she is used to eating all the soft stuff, apple chunks are great. It is amazing how much they can chew without teeth!