Can anyone help me figure out how to fix this watch? I had seen a video that said it was likely that Center screw being loose so it wouldn't wind, but even after tightening that it won't start ticking. Bought some simple tools and I'm willing to mess with it (I believe it was a cheap watch) I just have no clue what to do.
The day dial is built into the watch movement, so replacing the movement will get you a new, working day dial. I'm not sure what model of watch you have, but there are replacement hands you can buy (for example, here: https://theyobokies.com/?mod=product&sec=item&task=list&cid=2) that might kind of match the original ones. If the seconds hand is still a little bent, you can try replacing that, too.
Putting the hands on the movement can be kind of difficult -- there's a tiny little hole in the inner part of the hand that fits onto a tiny pin in the middle of the dial. I'd recommend checking out some videos about it on YouTube before you try it. You'll want a loupe and some tweezers if you decide to do it. Replacing the movement does mean you'll need to remove the old hands and dial and then put them on the new movement.