Welcome aboard and there are so many mods to choose from.
Currently these are the ones I am using and after I finish playing the game all the way through I am going to give the Grey Wolves mod a go
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Ail Sky Mod V2
Bad Weather Guns
Bearings
Big Sound Pack
Church Custom Emblems Vol 1
Float Planes Mod
Hollywood Part 2
Hospital Ship Lights v1.2
Landscape.Mod
Lights
Merchant Mod 01 External Cargo Juju
Military Mod 06 DD Clemson Juju
Military Mod 05 DD V&W Juju
Military Mod 04 CO Flower Juju
Military Mod 03 PT Elco Juju
Military Mod 02 DD Fletcher Juju
Military Mod 01 Guns n Stuff Juju
Merchant Mod 03 C3 Cargo Juju
Merchant Mod 02 C2 Cargo Juju
Moose Measure
NF Boat L Lights
Radar Detection
T2 Range Mod
Torpedo
Transparent Torp Screen
Tree.Mod
Uniform Mod V.2
Harbour.Mod
Sobers Real Smoke 1.0
Ammo Mod
ANZACMICKs Damage Tex V.1
Dials Perdu 1.1
S Class US Sub
Water.Mod
Swatstika Mod
Flag Mod
Depth Gauge Mod 1.4
Bowspray 1.2
Officer Shortcut Mod
Transparent Dial Background
Harbour Traffic 1.47
JCWolf Leer v.5
Donots Periscope Update 1.5
Uboat Reflections v2.0 Cable Fix
IX Camo Red Shark