How should I improve my voice? And What do you think of my video?

I posted on youtube, Hoping to get a few people to comment and watch
and sub?
Also, anything I should Improve on (besides the fact I looked really
bad that day) for my voice?
Also would love if people could suggest songs for my voice cause I
wanna make some more videos,
Thanks :3
Video:

http://www.youtube.com/watch?v=pl0agjBlzNs