Have you found some difficulties in speaking? do your audience believe what you have talked about or do you want to become a guy who is always a 'talking focus'? Here are some suggestion for your first step.
1, prepare enough, it is very helpful when you want to talk about something which you are unfamlier with. you can write down the main topics you want to express or show, and you can contral or adjust the talking process by this way.
2, keep fluent, you can get confidence from your fluent speaking, and the audience could believe what you have said. So, if you have prepared enough, try to speak fluently, it will improve your influence among the audience.
3, get reaction, the talking would become upset if you just say and others just listen, there are no exchage or discussion.Maybe you have prepared enough but the audience do not have interest, and then you must adjust your way or topic timely to focus their attention.
4, put into your emotion, the logical way is right forever but not always acceptable. there is an old saying: move others with emotion, convince other with logic. you have a good topic , if you can put your emotion into the talking, it will be more wonderful.