You already know you don't want to read a speech verbatim from a screen or notes. You could memorize the speech word-for-word, but not everyone is able to do that--and it isn't natural. Instead, use "key images" to remember your important points.
Want to maximize your free time? One of most productive uses of your spare time is to learn a new skill. This massive self education idea list covers all aspects of personal development, personal growth, communication skills, mental skills and some skills