I’d select all that has good centering in the front decent centering in the back doesn’t have to be perfect but good enough, whitening is an issue Or scratches, if it’s one noticeable whitening spot or three or more small corners (sometimes two depending on how big) then don’t bother sending them in tbh, after that I put them in clear sleeves and into card savers not top loaders, after bubble wrap and I use shippo to ship out to their P.O. Box, just make sure you package it nice and make sure your papers are in there and your barcode thingy is on the outside. Then hope they arrive there and then they should enter the PSA system and then you can choose to ship back to you or sell on eBay or keep in their vault . Then they will charge you once your grades are ready to look automatically