How to get abs

Hello everyone,

Being someone who has been overweight most of my life, I've never seen my
ab muscles. I'm just curious if eating right and doing some exercise is
enough to be able to see the outline of one's abs. I mostly do cardio
workouts with my stairstepper (1hr/day) and walk (1.5 hr/day). I'm eating
better than I ever have in my life and weight is coming off fairly quick and
steady.

Does one have to do sit-ups in order to see the ab muscles or is this just
to make them more prominent or thicker. I don't care to get my muscles cut
real deep, just want them to be able to be seen. Do I need to achieve a
certain body fat percentage to achieve see my abs, and if so what is the
percentage that most people get to in order to see their abs?

I do have some limitations to some exercises due to my disability after
being in an accident, but this mainly is targeted to my legs.

Thanks for any input,

Paul
300/230/175