YouTube has an audio library you can use for music, and even sound effects. Some editing software also has music you can use for free too.Here's a tip or two I'd like..
How do I know what music I can use on my videos? What is public domain or whatever it's called?
Same goes for logos. What graphics can I use? I am in no way artistic but I can take my way around basic stuff.
Also, I guess this is three, free graphic / picture editing programs so I can make a logo.
Not sure what you mean by logos/graphics?
The GIMP is a free editing program which is really quite cool. I use it to make .png images etc and to help with thumbnails etc.