advice needed!

Hi Mums, I need some tips! I'm suddenly needing to go back to work next week 😵 My baby is 6 months old and has just started taking a bottle which is good. She is breast fed on demand and we have only just started introducing solids. I need advice on how I can continue breastfeeding while being away from her. I have a pump & will start trying to build up a stash before next week. How many bottles do your LOs take? How often will I need to pump at work? I'll be doing a 5 hour shift and a 7.5 hour shift each week. I'm SO determined to keep breastfeeding when I'm with her and bottle feeding (breast milk) when I'm away. She'll be with her Dad which is nice but I'm also emotional about leaving her, especially because I'm nurse her to sleep which will be a bit of a shock to have it taken away so abruptly. 😢 ANY advice would be amazing xx