I lost my grandma back when I was 9. It was a terrible situation, as she was like my second mother. My mom worked and went to school when I was a kid, and my father was absent. I was always with my grandma as a kid, and her and I were VERY close. Its almost been 14 years and I still have vivid memories of the times we shared.
Give yourself time to grieve, but not too much. I find it's better to keep busy, then to sit and dwell on the situation. I lost my 25 year old cousin a few years ago and I poured myself into my job after the funeral. Remember everyone is different when it comes to these delicate situations. Figure out what works best to help you get through these times. Some need a distraction (like me), and others need to seek out someone to talk to and that's the only way to get closure.
Have you thought about hitting up a bookstore? I'm positive there's literature on the subject that might be of help!
I wish you the best, my friend! Good thoughts, and prayers are being sent your way!