I like to sing through an SM57 rather than an SM58 (just to be different from the rest of the world). ALthough these mics have the same capsule the grill makes a big difference in frequency response.

SM57s are usually used for Guitar and snare / toms and S8s for vocals.

Tascam portastudios (liek the 424 mk III) are also a great place to start learning about recording.