A warm welcome ‘57chevy’ to the Subsim family.
You will always find someone here to help you.
Link to my SH3 – SH4 – SH5 posts:
Step By Step Tutorials & How To Do It.
Also Included Are Some Useful Download Links
http://www.subsim.com/radioroom/showthread.php?t=211804
You can use TDW’Generic File Patcher with STEAM see my Tutorial Post #125
You will find everything a newbie needs in my tutorials etc.
Quote > Do you have to start a new campaign to see the mods in action?
This will depend on what mods you are going to enable.
Most mods can be enabled when you are docked in the bunker.
A few mods enabled are not compatible with your previous game save and a New Career is needed.
The documentation or when you go to download from Subsim will normally tell you what the situation is.
Refulling and rearming are done in your home port, look for the submarine icon or you can refit in Heligoland.
I do not have an answer to your unlimited torps question but I am sure that someone will know the answer.