Suggested workflow, DNxHD, canon 60d, premiere

What’s up guys. I’m new here and I need some help. I shot a music video on my 60d at 1920×1080 24fps. I finished my first edit and when I exported and uploaded I noticed that my vid lost some quality when it appeared on YouTube. I was told about Apple pro res but I’m on PC so I would opt for DNxHD. My question is this: Do I need to import my footage into DNxHD first, then edit and export? Or can I just keep the edit I have and export it differently? I’m trying to get the best quality possible. The footage looks great when I edit but when I upload it almost looks like I recorded with a flip cam, not a 60d. Any help is very much appreciated, thanks!

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