PAC never lived poor or in the hood? It's like this place has the dumbest collection of people on the internet at times.....
Just listen to ALL his albums in chronological order. You 18, aint like u got a whole lot of jmportant stuff to do....You'll hear his improvements as a rapper from 2Pacalypse Now to 7 Day Theory. The only required posthumous album should be R U Still Down, since that album was the only one where the songs were more or less left in the original vibe in which PAC originally made them and are mostly solos. And since those songs are from 93-94 you should listen to that before the Deathrow albums.
After that you can go through the other posthumous albums and then go to YouTube and peep the original versions of those songs and see how badly the majority of them were butchered. Some of them you can't find the og's easily, some stuff has never been remixed or released. There's a lot to find with some research on unreleased and og PAC music