You're in for a treat but do get LwAmi from Bills SubGuru its a great mod ! Luftwolf and Amizaur (mainly) have altered and developed many things in vanilla and pushed the envelope closer to reality.
If your a bubblehead try out Amis excellent 'advanced torp control' - it goes way beyond the same in SCX.
Bills got a great range of goodies and the community have produced some fantastic campaigns and scenarios:-
http://www.subguru.com/downloads.html
Also give Commanders Accademy a look :-
http://www.commanders-academy.com/
(Its currently down for maintanence)
Mainly have fun !
