how to do a killer startup pitch at my UNI's business startup competition??

So my uni is organizing a business startup idea competition, and i wish to participate...but my idea is a lil bit vague i mean not that out of the ordinary....but i have been told ..communication and execution majority wins most of these competitions...

now there will 2 rounds the first round is just pitching and presenting ur ideas to the judges also making a ppt for ur idea...teams which qualify this round move to 2nd round where they have to present a prototype of ur idea...but first lets focus on round 1 also i dont have team partners...im alone on this...

now can you guys please guide me with the fundamentals on how do i fully express myself make a very good impression infront of the judges....

if there is any piece of content that will help me regarding this topic please direct me towards it...

also how do i make my pitch execution very perfect... i mean how i sell my product my idea to the judges very impactfully?

this competition will be judged on the basis how feasible ur idea is, how it will generate revenue and how is the market conditions for ur product to deploy...

can u guys tell me which points i need to reasearch for this ...just direct me there

and how do i make a killer ppt in 3 pages thats impresses the judges and is presenting clearfull and direct with no conjustion

also how do i make sure my idea is like not illegal and will not become illegal when i actually launch it...like how do match up the legalities policies compliances around it....i dont know how do this thing...

also how do i prepare for the cross questioning of the judges ...like what type of practising is needed for this...how do i prepare for this....please tell me the ways the resources for it...

im but a novice....and i was very hesitant to even register for the competition alone...but somehow i did...