"we need to talk"

Na
What are some important things to talk about with someone who you love and want a long-term relationship and ultimately a marriage with?
Not that it's an urgent issue right now, but I want to talk to my love about what he wants in the future as far as expectations for our relationship. (I know he wants to get married and have kids, etc but I want to know what he expects as far as our lifestyle and what he expects from me) how do I bring this up in an "I just want to learn about your mindset" way instead of an "give me the answers and I expect this to be definite" way because I know things will change over time lol