IM not sure what kinda pre amp your getting but the outputs should go into the delta without too much problem. As far as your drum beat, Id export to a multi-track program then overdub the vocals, then if need throw them back into acid for further work. The Sm58 is a good enough mic, Ive worked with less myself. Do final edits in SF 5.0 and you done, SF will do your Cd burns after your done...Feel free to experiment with file transfers between the different programs you have...
I have a 1/8th inch Stereo to 2 rca type of cord, with the delta just look to see what kind of cord you can hook between that and the Pre.... Have fun.
Peace,
Dennis