Running a Giveaway Contest

Hello,

I want to giveaway a item to my subscribers through a contest.

What is the best way to present it? Is there a template?
How would I randomly pick a winner who enters?
I notice most people doing this has these professional looking Official Rules... Is that necessary?

Thank you

There is a lot of services for that

https://www.google.com/search?q=giv...sorQAhUC4mMKHWtxCa8QvwUIGigA&biw=1408&bih=670

Some of them are free.

tell them to subscribe on your channel and comment done !
then just randomly pick someone for the giveaway