...dpi at 300 to 600dpi, 600 yields slightly better accuracy than 300dpi, however 300dpi is sufficient...
...downsample after OCR (if required) is recommended, not before...
...scan in lineart (1bit) or greyscale to keep file size down, color will increase document size and slower processing...
...i've only come across point sizes as low as 7 point in documents i have scanned and OCR'd, not experienced yet with anything lower...
...7 point worked OK here...
Andrew