Welcome to OF.
Nice watches and worth sorting out.
If you post where you are, someone will be able to recommend a reliable watch repairer near you who knows what he or she is doing. Don’t take it to your local mall.
So far as the crystals are concerned, if you look carefully in the centre, if there’s an 'omega' etched in the glass, it’s an original crystal and worth keeping so you’ll need to polish the crystal.
For straps, I’d get a couple of nice leather 18mm on eBay to start with. They’ll cost you £10-15 or so. You can always upgrade when you decide what style you prefer
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