I think some people here just don't like this style of music. Well, I do. I'd say:
Savannah: yeah, try an arrangement. Until then, read up here on how to use the mics you have on your acoustic guitar. As for the singing, I don't mind a lot of off pitch stuff, but you gotta sound like you mean it. So keep singing the part until you can sing it with authority. Joe Strummer couldn't sing to save his life, but the Clash still rock. Dig up an ancient track called Death is a Star and you'll see what I mean.
Wake Up: I actually like this track a lot. The snare is, probably against its better judgment, syncopated in a cool way. The micing technique on the snare could use some help, so read up on that too. The guitar parts are cool, but cut 'em until you lose the flubbed notes. For the vocal, try playing the melody on your guitar, then listen to the guitar in the cue to help you stay on pitch. If you're really up for a challenge, try adding a harmony vocal on the chorus using the same technique. Also, during the verses, drop the guitars in the mix a little, or play a simpler part and save the good stuff for the breaks.