breastfeeding/pumping

FTM and I'm totally lost! I plan on breastfeeding as I will be a SAHM but I want to also pump a lot so my husband can eventually help with the feedings and I want to make sure to have a huge stash just in case I run into supply issues a few months in. I'm wondering how often I will be able to pump if I'm breastfeeding all the time?
I also just got my medela pump in style advanced last week but not sure if that has everything I will need? I know I need to buy storage bags but are there any other accessories I definitely need to have in order to pump? Thanks!!