Choose three topics of basketball you want to talk about in your speech. For example, history, great players and great teams, are three topics that cover a wide range of the game of basketball and can be used for an informative speech.
Write a 2 to 3 minute speech about each topic. Include the most important dates, people and things of each topic. For example, the topic of history would include Dr. James Naismith (inventor of basketball), December 1891 (year basketball was invented) and Springfield, Massachusetts (place where it was invented). For each topic, try to include an interesting fact or surprising anecdote about the topic. For example, on the history topic, the first basket used in the first games of basketball was actually a peach basket and when the ball was thrown in it, someone had to retrieve it with a ladder--because the bottom wasn't cut out.
Write an introduction to your speech. It should include the reason you are speaking about basketball and what you hope to teach your audience about basketball with your speech.
Write an ending to your speech. Make sure to include a brief synopsis of the most crucial parts of your speech.
Review your speech and write in transitions. Find ways to bridge the final point of your previous topic with the first point of your next topic. If this is impossible, use transitioning words like, "on a different topic" or "moving on".