Need Help Choosing Parts for my first ever DIY computer build

hi awesome people of this galaxy,

I want to build a NAS which can run maximum 2 virtual machines, must back up the data so act as NAS and if possible do some plex things too. This is what I have selected as of now. So couple of questions,

  1. Is this built good enough for me?
  2. Which os I should use, Unraid or truenas for my requirements?
  3. Or is there any better build than this? My max budget is 1200.

This is my very first DIY build and very first post in community too. So sorry in advance if I didn’t provide more info or anything.

Link to my build- https://www.microcenter.com/site/content/custom-pc-builder.aspx?load=1e1fcac3-8d85-4955-b5f6-049d956bec40

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