Well everybody works differently and you'll have to find your own thing, I say this because I just went through something myself, more specifically my grandmother's death, but I found it interesting that everybody reacted differently, though most were crying they were all crying for different reasons, some because they would never see her again, some because of failed promises and in a particular case, just regret that she never told her that she loved her.
I myself am not sad at all, mostly because my reaction to the news was to have a flashback of everything we ever did together, and after that I just felt happy that I got to know her and that we shared so many experiences, as I said everybody reacts differently and you're going to have to find you're own thing, most people were trying to cope with it by being as helpful as possible, some just got as drunk as possible and some just spent the whole day crying, just do whatever feels natural to you, maybe you need to get drunk, maybe you need to help, maybe you just need to be alone, maybe you need to play or maybe you just need to be sad for a while.