I have an illustration in my Aaron Shearer "Classic Guitar Technique - Vol. 1" book that I could scan for you when I get home and find the book, but in the meantime I will try to describe it. It shows the nails of the right hand as being longer, and then filed with a taper so that from left to right as you look at your hand from above, the nail tapers quickly to the longest point, then tapers off gradually as it rounds more to the right edge of the nail. But this fingernail technique is designed for the soft nylon strings on a classical guitar. If you try to use your nails on a steel stringed acoustic or electric, I'm afraid that they might break because the strings are so hard. This is why fingerpicks were invented. What I do is to pick with the tips of my fingers, not the nail. If your guitar is made from a hard wood and it is not too large, the picking should be pronounced and sound good this way. You'll see some guitar ads that state "excellent for fingerpicking." This is what is meant by the ads - that the tonal properties of the guitar will let the notes ring out clearly when picked with the fleshy part of the finger and not the nail.

I think you should cut your nails short so its easier to play, and stick with a pick. After all, I'm sure you don't want your nails breaking off due to the hardness of the strings.