SM-G531M "Grand Prime" users here.?

Looking for:
1) Stock firmware download
2) Root process
3) TWRP compatible version
4) Unlock Bootloader procedures

Are there any good threads for my requests, post links please..I will certainly continue my search, and if I find good threads, I will post here..

New to Samsung devices, and not having very much success with this model as per development..

Have visited Samsung's firmware downloads, but my model isn't listed..

ALSO..Is there a list that one can download with all the Grand Prime models, that include country and language.?

Thanks for ANY help..