First pumping!

My daughter was born on Friday and I was able to feed her well right after the c-section. I decided to pump shortly after and was able to get an oz of colostrum out! I didn't get anything at all after that and was worried but luckily just pumped 20ml so my milk is starting to come back. I hated I had to put her on formula for the last day or so, but she is 4lbs so I wanted to make sure she got plenty of food and also needed to see how much she was eating. My nipples are too big for her little mouth so I will be exclusively pumping. I plan on pumping every 2 hours to get my milk supply in, has anyone had success doing it that way or should I space them more apart? Thanks!