Welcome to the Subsim Forums, AllegedBlackman.
Since you're basically just starting out, I would advice you keep things simple.
There are so many mods available for SH4 v1.5 that you can easily get confused. There are mods for just the vanilla version (just v1.5), mods for TMO, mods for RFB, mods for FORTS so forth and so on.
Start with what you already have, maybe add
GFO and go from there. As you gain some confidence start branching out and see what you like and don't like. And of course, you will have questions and in these forums there many people who are always more than willing to help you out.
So you're in the right place, Good Luck and Good Hunting.......