#1
beginner songs for guitar.i usually play bass but wanted to up my list of i-know-how-to-kinda-play-that instruments
#2
First off, good idea on wanting to increase the number of instruments you-know-how-to-kinda-play. My first suggestion would be Sunshine Of Your Love, by Cream. It's a very simple song based on a pretty easy riff. However, as I don't know what music you listen to mainly, this is just a suggestion.
"Notes are expensive. . .use them wisely"-B.B. King

"It's been very important throughout my career that I've met all the guys I've copied, because at each stage they've said, 'Don't play like me, play like you."-Eric Clapton
#3
Why don't you actually learn music theory, then you'll be able to learn more instruments.
Words to live by: Haters gonna' hate.
#4
the list is endless of easy songs to learn. I think there is a section on that somewhere though. Look around. I think its listed under newbie songs or something.
.:Just because you can sweep pick doesn't make you good:.