you can take the audio from vids using AVS Video Converter 6 its free and you can put it to wav, mp3 exc
now for audio editing you should have Audacity for advanced stuff and its like 30 day free trail i think if yu dont wanna buy it
for something free if you wanna keep making boards/need the time try Free Audio Editor
basic, easy gets the job done
its completely free
http://www.free-audio-editor.com/for recording sounds .dont bother with that shit most are not free an if they are the sound wont be luxury..what you will need is youtube downloader
http://youtubedownload.altervista.org/ it can convert your videos aswell to what you want for example MPEG or iponevids exc