Can anybody give me tips on public speaking ?

I have an jnterview at my job for a higher position . It involves running a department in which I will have to get my team together and go over numbers and announcements and all that . But I get very nervous, I start getting my words out of whack, get the sweats and blush .. how can I just be chill ? Please help ! It’ll be with a department that is new to me, as well .