I need good tips to improve upon my debating skills?

I’m taking part in a Model United Nations event that is being hosted in school. I’ve been allotted my country. We’ll be discussing current affairs, and the two topics that’ll be holding up the debating of the committee. If you have any prior experience in debate, could you please provide me with some advice on improving on my skills, and my confidence.
I’m not a debater. I’ve only been part of such an event once before, I need some good tips. Thank you.