Actually you must choose a frame rate when you start a new timeline- it cannot be changed once you start editing. As most of your footage is already 24p I would highly recommend using that as your timebase.
I would definitely try to leave the downconvert to the last step in the chain to maximize quality on the fix shots. Resolve has really excellent noise removal capabilities as well- however you would need to purchase the full version to do the work in 4K.
Some contents or functionalities here are not available due to your cookie preferences!
This happens because the functionality/content marked as “Google Youtube” uses cookies that you choosed to keep disabled. In order to view this content or use this functionality, please enable cookies: click here to open your cookie preferences.