I am new to Gerrit and want to create a new Patch when new changes are submitted. I setup Gerrit with this guide https://review.typo3.org/Documentation/install-quick.html
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Don't add the Change-Id on your own. Install the commit-msg hook as described here. This will automatically create the Change-Id for you.
If you want to improve a patch by uploading a new patch-set, use git-commit --amend
and keep the Change-Id line as it is.
You can see a description of the workflow here: http://wiki.typo3.org/Contribution_Walkthrough_with_CommandLine