The important things about mods PotroastXII, is 1. Don't have SH4 (or 3 or 5) installed in "C:\Program Files" and 2. The folder structure of the mod prior to activation. When you want to try a mod, give a shout. In the meantime, read around on the site, especially the stickies like THEBERBSTER's collection
SH4<>Tutorials<>... and Rockin Robbin's
Sub Skipper's Bag of Tricks. Some good readin' there. Forgive my manners, and belatedly "welcome to SubSim