Well done op for being willing to contribute.
It doesn't matter if it's a few days or a week or two after a punt to write your review but that's good advice above, don't review on the day. Let yourself calm down and you'll review more subjectively then.
As to the format... have a read of a few different reviews and use what you feel comfortable with.
Remember..... we don't give a toss about your performance, it's her your reviewing.
We want to know..... what's the venue like, can we park, are we safe, does she look like her pics, is her age accurate, does she deliver her likes and did you enjoy.
It's your review, write it how you feel comfortable with.
We don't like "treat her well" "this and that shall remain private" "she's a gem" etc etc
Welcome aboard