A Laser printer will provide a high quality masters which can be copied onto special transparency film with a copy machine. Some software, such as PowerPoint, making developing standard presentations more convenient, preparing transparencies requires design and layout skills rather than the availability of fancy presentation. Use a simple plain font. Bold type is permissible, however you should avoid cursive scripts, underlining, shadowed types. Because those types make the text harder to read.
Transparencies can be either horizontal or vertical.
Keep the actual image area to 150mm wide and 215mm high, or may be 200mm wide and 200mm high more reasonable. These size gave an adequate margin on the film for folding, taping into a transparency frame. Overhead transparencies are the only aids to understand your presentation, not as a substitute for a verbal presentation. Use an outline form with brief phrases for emphasis, to help the audience keep on the same point that you are on. Use single words or phrases rather than sentences.