Best file format and other tips for uploading books in Universal Viewer?

Hi all – We are going to be using Universal Viewer to display scans of our books. For those of you that have experience with this – what is the best way to do this? We haven’t scanned yet, so what file format should we scan in (PDF, JPG, TIFF, other)? Do you recommend a file size limit per page? Do you have any tips for uploading items?

For accessibility, OCR would be great, but happy to hear if you highly recommend some other method that inhibits OCR!