Hello I am due in 5 weeks with my first and. Am very set on breast feeding! (My boobs have been leaking since week 14 and now they are horrible..) So I assume NY body will allow me to breast feed ..my question is when should I start pumping (after he is born obviously)

I just got a... Medela double pump and wanted to know when I can use it and when I can let my SO feed him from bottles... I don't want to mess up and start bottles to soon but my SO is already dying to feed him and he isn't even here yet lol... I'm so confused