You can skip the tutorials if you want. While you can get something out of them, I find it much more useful to learn by doing single missions. As far as graphical immersion, I can't contribute much more on that point as I run GWX at 1360x768 with Widescreen MaGui (my monitor won't run 1920x1080), so you likely already have me beat. Maybe check out Sailor Steve's LSH link above, as I believe it's the graphics king of the mega-mods. Do be aware that you must choose between either GWX or LSH, as they are not compatible with each other.
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In the town where I was born
Lived a man who sailed to sea
And he told us of his life
In the land of submarines

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