Creating an Android update.zip package: What should it look like?

[Ares30]

Should it look like this?

META-INF/
+- com/
+- google/
+- android/
+- update-script
+- update-binary
+- updater-script
system/
+- etc/
+- sysctl.conf
+- security/
+- cacerts.bks

( Howto: create an Android update.zip package | fokke.org )

Do these files have to be specific to your device? Do the system and META-INF folders need to be inside another folder or not? How would I go about finding the right updater-script and any other files that need to be specific to my device (Alcatel One Touch Evolve). How do I sign an update.zip package?

I've done some research but everything is confusing and I just need these questions to be cleared up. Thank you very much!
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