The faster the better. Resolution refers to the depth and breadth at which your monitor will display a picture. 640 by 480 is the minimum. If you choose a monitor with a higher resolution such as 1280 by 1040, your picture will be brighter and crisper. Consider the higher resolution if you intend to use a lot of graphic data.
Size is measured in the diameter of the screen.
Printers dot matrix - rather slow and not very good for printing graphics or colors. When you're selecting a printer you should consider the cost of printing not just cost of printer. Compare the prices of the ink cartridges both color and black ink. Does the printer require special paper or can you use standard bond paper. In the long run these considerations will determine the cost of printing.