Screen protection

I've used a Zagg screen protector on all four Apple watches I've owned, no issues. I wouldn't put a case on mine so no help there.

Check out the options available from Amazon or BestBuy. Personally, screen protectors which are glass seem to offer the most touch. Zagg is an excellent brand. Spigen is another.

In terms of cases, there are loads of options and that would more be your personal preference.