At the moment the iPhone 12 is so new (with some models just being released two days ago), there will be no parts for a little while (especially OEM and high quality parts). I would recommend that if the screen isn’t badly cracked to get a good case to cover the back of your iPhone 12 that is cracked so that it isn’t as noticeable and doesn’t get any more damage. As for the screen, for now you can leave it as it is, or maybe try an install a screen protector over it (however bubbles will probably be an issue). Replacement parts that are of good quality usually take maybe two months, and can be expensive (especially the OLED screen). The housings shouldn’t cost too much and will probably be available before the screens - but if you are newer to repairs then get one that has the small parts installed. Maybe look for a repair company that does refurbishing of OLED screens, and will just replace the top glass layer - it may cost a fair bit though?
hope this helps!
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