30-40 docs per day is nothing. 30-60 minutes max.
After you establish the routine, most anybody could follow the steps.
Sheet Feeders are generally used when the documents are all the same size, per your description that is not your scenario.
Re: locating the files in future:
Direrctory/Folder structure along with consistent use of same file names for data, along with dates tacked on end. would be crucial.
EX: InvSeller18_1101
Your likely already maintaining some records and a simple rework would likely do for the backups.
Your also going to need accompanying software (if not already included (some brands do and some don not) that allows scan out to PDF.
Unless you have color documents to scan, either Grayscale (256 B&W) of line-art (two color B&W).
The difference between the two is that very rarely are line-art images capable of being transformed to actual text, while Grayscale in most instances allows OCR (even if not present needs, possibly a future requirement).
IMO for your requirements, most any scanner will suffice.
You just need a plan and the ability to get past the learning curve that has defeated most users (at least in popularity) of scanners for decades.
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Best Don
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