I am making my first app and just signed and did all that to make a official signed, non debugging apk. Now, if I want to make a small change, do I need to go through all the resigning again, and use the same key, or what?
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Yes, you must resign and you should use the same key if you want your users to be able to upgrade without difficulty (if you change the key it is considered a different app).
You should also update the version info in the AndroidManifest.xml file.