Here’s an article I’ve written for Sound and Music (who I used to work for), looking at resources for sound design online:
http://www.soundandmusic.org/features/sound-film/sound-design-web
there are quite a few other things on the site I’ve done, including the guide to field recording:
http://www.soundandmusic.org/artist-area/artists-toolkit/how-tos/fieldrecording