Any pumping and working moms want to share their routine?

So I'm headed back to work and have so many questions. I'm a RN so I work 12 hour shifts throughout the day. Just looking for examples of pumping times and how you manage to keep your supply up. I've been EBF with occasional bottles of breast milk here and there. Also I started back on birth control and my supply dropped drastically 😞. Any input is greatly appreciated TIA!