First and foremost, do not bite your nails no matter what.
And if you have the habit, now is the best time to quit.

With the habit cured, we can now focus on the very first step towards a healthy set of beatiful nails by paying attention to washing your nails regularly. Have a soft bristle nail brush within sight of your shower or sink. You could make it a routine mini spa session while you shower before going to bed by gently lather some hand soap at your finger tips and work softly with the nail brush both on the surface and underneath your nails.

Rinse throughly and follow thru with hand lotion.

Forget about fake glued-on nails, they do more harm than good to your nails. To get the ideal shaped nail, trim excessive long nails and file your nails with a manicure set to prevent painful breakage when you least expected it. Applying a coat of quality nail polish will add luster and sheen while at the same time strengthening you nails by giving it an extra layer of protection.