Currently Being ModeratedApr 24, 2013 4:33 AM (in response to xpolly1990)
any iPad running iOS5 and beyond i believe (Not sure if it started with 5 but know it definitely works on iOS6+) has air print abilities.
Air Print means that the iPad will natively print to printers that have the proper software.
See if your printer is on this list
or purchase one that's on this list and you should be good to go.
If your printer isn't on the list you can still print, you just need third party help. Some printer manufacturers have apps you can download and install. You can also look for third party apps like print n share, printopia or print central to get printing abilities (all you need then is a wifi printer)
Not sure what you mean about using an SD card. THere is no support to import or export documents via a SD card with the iPad.
As to scanning direct to your iPad, check the printer and see what it does. do some research, and for many models you can even access the manual online, so you can read through that before you even purchase the printer to see what it does.