I Need Guidance.

[Shaefer]

What`s going on guys!

So I have decided to pick up SH4 (Wolves of the pacific) from Steam. SH-4 is the the only SH game I skipped, I don`t know why, maybe it had to do with the weird looking american submarines... But now I am ready for it!
I am currently doing a let`s play of SH-5 on my youtube channel, and I enjoy that game immensely. But I want a change of environment, and the pacific sounds great to me as well as experience the american submarines and the american side of the war.
But before I pick up this game I need some help from you guys, because I have some important questions I need answering. I know nothing about modding this game.
Thank you very much!

# Will the game run flawlessly on windows 10 64 bit?
# Can I play the game in 16X9 resoultion 1920X1080?
# Do I need the expansion u-boat missions?
# Is the game plagued with crashes/bugs?
# Is it as hard to mod as the Steam version of SH5? (I reckon I need to mod this game to get the best experience)
# Which modpack do you guys recommend? I am going to play the game with full realism, except external view.
# I want a modpack that enhance the graphics as much as possible, same with the the gameplay.
# How different is this game compared to SH-5 when it comes to manual tageting with no map contacts?