Your team will come together and produce the best outcome possible. As a student leader, you will have to speak in front of groups scores of times before the end of your leadership career. You will have to convey all kinds of messages, from tedious announcements to motivating words of wisdom. Practice only comes from doing, but perhaps I can give you some simple knowledge here. To deliver a successful speech to a group, you must realize that many factors go into how the group will react to your words.
Audiences differ in age level, education, irritability, and level of excitability.
You must be able to detect and assess these and other factors within the first few moments of your speech, and you MUST adapt your style for what you detect. Some common sense will help you make these judgments. If you are speaking to a group of high school convention-goers on the third morning of their convention, common sense tells you that sleep deprivation has probably set in, and they will be irritable and not very receptive to harsh or negative statements of any kind. Also, common sense tells you that you simply cannot use the same vocabulary when giving a speech to a group of freshmen as you would when speaking to seniors. The important part is to adjust according to the type of audience to whom you are speaking.