I need advice...

On solids (purees). My little girl is 6.5 months (7 months on the 28th) and we started purees almost 2 weeks ago. We've done avocado, squash, carrot, sweet potato, and green beans. We start with just a spoonful then the next day increase it to 2 spoonfuls but we measured it today and that was not even 1/2 oz and I read somewhere we should be feeding solids 2 oz 3 times a day? Right now it's only once a day after her second nap. She gets four 7 oz bottles of formula a day too. Any tips? Also, how do you know when to start stage 2 purees? When do you start the meat purees? I'm a FTM and so clueless. Everyone I've asked says "you seek to be doing everything right. Do what's best for you." I would appreciate tips! Thanks!