First, the point and shoots get their exposures by using fast film with small apertures (higher fstop numbers).
Your EX will only work automatically with 50, 100 or 400 ASA film.
To simplify, use 1/60th, F11 or 16, and 400 ASA film.
If you're at thirty feet depth or shallower on a bright day or distance is under five feet, go to F22.
That will get you in the ballpark, and print film is fairly forgiving for exposures, and the TTL is pretty good.
Start your shooting, however, with learning to at least roughly set your focus. 18 in= closeup, 3ft=closest focus before the click, and about 6 feet for everything else.
Now that I've given you a rough guide, two sites with outstanding instruction in basics of exposure are
http://www.DAVEREAD.COM
and
http://www.utahdiving.com/photos/pic-clas.htm
Once you get comfortable, the shots get to be more fun when you expose them better.
A practice roll or two of 100 ASA in daylight, choosing flowers and plants (or cooperative critters) will give you some cheaply won familiarity and probably amaze you with what the camera can do on land close up.
Have fun, and celebrate the freedom the settings give you!
John