I need assisntace with System Shock 2 and Darksouls MODs. (Steam version)

You should get graphical assistance mods in DS like DSfix and stuff.

Don't know about System Shock 2, I believe there's a mod for the graphics but don't know any details. :(

For Dark Souls, one source for help is here - basically you want to get "DSfix" working first, then "DSCfix" and also "DSMfix" if you're not using a controller. There's other stuff as well, but that should be enough to get you started. Good luck!

Check the Sytem Shock 2 guide on community hub. Just install everything that recommended there.

If you do some digging, there are SS2 graphical updates, as well as a few FMs (fan-made missions), along with the loader, editor and a patch that fixes a few things and adds coop (I think the patch may have been slipstreamed into it already, though).

Check out Systemshock.org as a good place to begin.

DSFix is all you NEED before playing. There are some silly retextures on the nexus if you want those.

I recommend these for DarkSouls:
High-Res UI and Subtitles
Tree LOD Texture Fix
Dark Souls Flora Overhaul

A wiki guide for Dark Souls mods
Connectivity fix, DSFix are the most important IMHO.
If you want any non spoilery advice/build thoughts for Dark Souls give me a shout, I played a bunch on xbox and I'm starting out on PC. So if we're similar level and running connectivity fix I could probably join you to help with bosses too :)