Well i write about this type of stuff for living so here are some tips.
There are many great tipe here but it is different for every scanner you have too experimnet.
I will include a scan that i have set too 300 dpi and a note card size.
on many scanner you can select if you scan a full page or note card. Mein i select note card and then it really zooms in the chip. If you select A4 then its further away. When you buy your scanner make sure it has a white background some have black and its sucks for chip scanning. When you scan just make sure you file doesn't become too pic. I have mein set at 256 colors i believe. Also if the shadow is bad or the scan is too dark, try messing around with the brightness setting that been helping me a lot. I guess that is most i can cover in a minute.
P.S. I don't want anybody picking a fight about this post now :)