Hi all, My wee girl is now 11 months old and u...

Hi all, My wee girl is now 11 months old and up until now has never had formula. She is breastfed 3 - 4 times a day. I am heading back to work in a few weeks so would like to start trying her on formula, but have no idea where to start with choosing one. Any help would be very much appreciated! Does she even need formula at this age or can I just go to cows milk??