I would llike to start a HL2 mod discussion thread, while I have questions.
1) How do I start?
2) It's legal, right?
3) Do I need to learn any languages?
4) Can I make my own guns/characters/HUD?

Thanks! slayer, I'm calling you! Lol.

A site I found:
http://www.hl2mods.co.uk/