It is often better to prepare a simple outline of what you are to speak on instead of writing the talk out word for word and reading it. Reading a talk may tie you down to say exactly what is written instead of being able to adapt as the Holy Ghost gives you "in the very moment, what ye shall say" (D&C 100:6).
President Gordon B. Hinckley (1910–2008) taught, "We must … speak out of [our] hearts rather than out of [our] books" (Teachings of Gordon B. Hinckley [1997], 619–20). By making your own experiences and testimony a vital part of your talk, you will be more likely to speak from your heart and affect those who hear your talk.
Remember, your ward leaders asked you to speak on the topic, so don't just rely on the thoughts and stories of others. As you follow the Spirit in preparing and giving the talk, He will help you know what to say as you speak to your ward or branch members.