#2
hmm, first off, i think the song really needs some drums to give it more structure. Otherwise all of the alternate time signatures can seem too random. Some nice riffage as well. Also, i think if you added a bass guitar, you could work out some nice basslines for this particular song.
#4
i started out that way too :P
maybe listen to some songs with good drum beats or look up some tabs with good beats and kind of get ideas from them?