Sadly Titan: XCIX: Part TWO is no longer in production, but the Titan: XCIX universe WILL continue in a new standalone 2D RPG. More news soon!
I might be slightly biased but this mod rocks :P Good stuff mate!
The best place you can learn to use hammer is ...
... i do believe there are video tutorails there, but there is also a massive wealth of knowledge in the tutorial section of there forum.
Enjoy and good luck!