The Canon Canoscan LiDE 70 flatbed scanner is a good, reasonably priced scanner that allows high quality scans from any A4 or smaller sized items. It has a compact, flat shape and comes with a USB cable to plug it into your computer (no power cord required apart from the USB).
I'm sure everyone has a different way of accessing scanned files - I open Photoshop CS2, click on File/Import/Canoscan LiDE 70. This should open up a ScanGear screen where you can choose whether you want the scan to be Photo (Color), Magazine (Color), Newspaper (B&W) or Document (Grayscale). I find that doing everything in Photo Color, then converting it manually in Photoshop to greyscale provides the best result for greyscale photos as having more colours retained while scanning results in more shades and levels of grey in the end, particularly with the lower priced scanners.
In the ScanGear window, you can also choose the destination of Print (300 dpi), Image Display (150 dpi) or OCR (300 dpi). If you want to reproduce your scan as commercially printed artwork, you'll need to select a 300 dpi option.
A number of Image Correction functions is available in the ScanGear window too - Fading Correction, Backlight Correction and Remove Gutter Shadow. When you are ready to scan, simply click on the "Scan" button and the Canon Canoscan LiDE 70 will make some noises. Remember not to lift the cover until the scanner has completed its once up and once back manoeuvre.
To be honest, I don't make full use of the functions and items of the Canon Canoscan LiDE 70 as being someone who uses Photoshop a lot, I prefer to make a 300dpi full colour scan and manipulate it outside of the scanner (to allow for "undo's" and "redo's"). This means all I have to do is save the original scan and return or revert to it, instead of having to scan something twice.
The beauty of this scanner is that you can put rather thick items into it, such as books - although the more the scanner cover is opened when scanning, the more any external light will affect the quality of the final scan by making it appear more washed out.
The Canon Canoscan LiDE 70 requires Windows 98/2000/ME/XP or MacOS X and various other requirements which can be viewed on the Dooyoo main product technical specifications tab. If you are a total beginner to scanners, you'll find this one pretty adequate, affordable and simple to use. If you are experienced in printing and reproductive scanning, you'll find this scanner a good little home scanner but not as high in quality as intermediate scanners and definitely not in the same league as drum scanners. However, if you were to scan a painting or drawing and use it on a commercially printed book cover it would be able to do a reasonable job in the right resolution up to A4 size.