Hey 
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You can use Marketplace assets you own, free Marketplace content, and the assets provided by KitBash3D. What you use that is non-original will have to be cited in your submission post.
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Yes, but this will have to be done in Unreal Engine as post-production is not permitted.
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No, you cannot use music that you do not own the rights to, have a license to, or have permission to use. The same goes for any type of asset. As per the Official Rules , “Although Sponsor is not reviewing Submissions for copyright violations, if, in the sole discretion of Sponsor, it is believed an Entrant’s Submission constitutes or may constitute copyright infringement, such Submission will be disqualified.” Please refer to the Official Rules for further details on submission criteria.
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Yes, you can use Movie Render Queue. Your video file should be encoded directly from Unreal only, using any methods in the documentation. We reserve the right to ask you to provide a screen recording of running the render from Movie Render Queue.
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Yes, Raytracing is permitted.
I hope this helps!