SMU's prompt said: "why do you want to study law in Dallas?" *I also believe Pepperdine has one about why their religious values are important to you.
Anyway, applying is really not as complicated as it sounds. All you need to do is tailor your resume to the study of law (should be easy), then write a few general personal statements about why you want to go to law school (a diversity statement if applicable), and an addendum if it applies to you. (i.e. I had a M.I.P. my freshman year of college --- not a big deal at all) ... Apply before November and the rest will really take care of itself.
All I am saying is that it is good to be concerned in advance, but don’t sweat the small stuff. I would again stress the importance of your LSAT score (you CAN help this) and your GPA (you CAN’T help this) above any of the aforementioned documents. Just take it one step at a time, you will learn as you go.
Note: essayedge.com is good if you are having trouble editing your P.S. or Resume.