Standalone 'Indie' Mods or Games:
Mods are Freeware:
Now that you've read the basics of modding. You can consider it your 'sideline'. If you want, then you can engage into modding. Who knows for sure? You can make a lot of friends, colleagues and teams online, but the internet is always full of tricks and surprises, and fake stuff, and some viruses. Practice makes perfect, if not, then practice makes better!
Happy Modding this 2008!!