Nut, for knowing when to come in, I always record my drums in Fruity Loops first...the first bar i always just have a rimshot counting the 1,2,3,4.....before mixdown, i delete that out....of course you can do the same thing with a voice counting in 1,2,3,4 and editing that out at the mixing stage....
As far as the recording, it sounded pretty damn good...the bass could have come up a tad along with that "lead" riff.....but all that isnt that important at this point...the main thing is getting a decent sound to "tape", and you did....you are on the way...
was that just one track off acoustic strumming?
If you still have the sm57 and Nt1, you may want to try some stereo micing since you have a stereo preamp.....panned hard right and left.....