Have you ever written a speech?

I've written a few, actually. Had to write a few for a public speaking class as well.

You need to grab the attention of your audience right from the start. Do NOT start your speech by posing a question unless it is unique and incredibly though-provoking. Tons of people start their speeches with questions that are not all that great and instantly lose the attention of their audience.

If you have the option to use a presentation aid, you should absolutely take advantage of that. For example, you can use a Powerpoint to back your speech up. Do not use the powerpoint as a script/put a lot of words on it. It's called an aid for a reason. Your powerpoint should only add to your presentation.

Have everything you need to know memorized very well. If you memorize all of the material that you are talking about, you will be able to have your speech flow naturally without stumbling over your words, etc. If you don't know a lot about what you're speaking about, you shouldn't be speaking about it.

When writing your speech, start with a basic barebones outline. How are you going to get the attention of your audience? What are your main points? How will you transition between them? Where are you getting your facts/statistics from?

Hope this helps. If you have any questions or need any help hit me up!