Software Deployment

Hi,

We have a setup product made with installshield 11.5 for windows !
all works correctly !

Now, we'd like to create a patch for this product !?
this patch must be replace some file > 50 in some folder and stop and start service.

someone can tell me how i can do a patch !?
someone knows a link where i can find some informations or details for to realize this !?

witch project i must to choose !?
basic msi project or quick patch project !?


Thanks for your all comment and suggest !
Christophe