Basically just get that AMCAS in as early as you can, b/c it will take a long time to certify it. Have your list of schools ready to go and submit ASAP as well. If you are waiting for MCAT scores, submit as soon as you find out you got that 37. Don't let anyone tell you you are being neurotic or gunnerish for getting your AMCAS in early early early.
The bottom line here is that many schools have rolling admissions. What this means is that if you dally around and dont get your stuff in you might end up interviewing in March for the 70th spot on the WL.
WLs are certainly not the end of the world, I was on a few myself, but wouldn't you rather get a few Nov/Dec interviews and maybe be sitting on an acceptance come Jan?