Your scanner should have a program that works with that specific scanner. If you do not have the software on hand, go to the products company website (epson, brother, HP, etc) and locate the software on their website. Once you install the software, you should be able to scan.
As for the types of documents you can scan into (the type of file that the scanned image is saved as) you have, but not limited to, JPEG, JPEG2k, PDF, IMG, Bitmap, etc.
Just depends on what your needing it to do...