An outline of your major topics should be your second slide, just after your title slide. Pie charts are good for showing relative parts of the whole. Use standard symbols if possible. Simple schematic diagrams effectively convey the structure of systems or relationships of objects. Show only what is necessary to explain how a thing works.
Tabular data is more legible and more easily compared on graphs or charts.
If you must use a table, keep it simple and include only items that you will mention. The third slide should present a concise outline of your presentation. The last slide in your presentation should state your major conclusions. Thorough preparation will improve your performance and make you more relaxed. In rehearsal, the primary task is to find out how you sound.