in the shell

ok. So, I watched Ghost in the Shell a few years back, but didnt really get it. I've seen several episodes from sesaon one of SAC, and most of season 2 so far. So I came back and watched the first movie. I understand it now, mostly. But is the Major in the show just the Major, or is she the merge of...

Hey, in what order should I watch Ghost in The Shell?
Im wathcing the first movie now.
But should I then watch season 1, and then Innocence?
Or innocence and then Season 1 then season 2?

Thanks