I'm not religious, I've done alot of good things and alot of bad things in my life.
Only rule to life, is be alive for the moment and take the time to make someone happy. That's the easiest way to be happy yourself. Make someone miserable, it'll haunt you for days.
Since you've been given a timescale, you've got more reason to make as many people happy as you can, through their happyness, you'll be fulfilled and they will remember you when you're not around.
Noone know's what tomorrow will bring, so don't think about the worst, work towards the best, make someone happy and enjoy the pleasure you'll get from seeing them smile.
Be honest, be forgiving, be alive. Don't waste time on the unneccessary. Don't be selfish, you, me, we...could all be gone tomorrow. Anyone who remembers us, should remember the best of us.
The best of you. Be strong.