What is the best way to make a large game

okay, so I want to make a expended game, So what is the best way to do it, divide the map up into separate scenes? or like Half-life where it loads in between stages (don’t know howto do it) Or is there anything else? And if its nessasary, how do I transport infromation from scene to scene

I’m not sure about some of the items you asked about since the question was not all together clear really, but for the last question, I found this section while looking up scene transitions that might help.

Thanks for the help guys, the game is a rpg btw if that helps? Anyway, thanks for the link and I´ll be sure to check out the faq.