I have never been fortunate enough to flip a domain, I've always had to work very hard at selling one.
Flipping to me sounds like buying/registering a domain and magically making money at it. While I am sure that can be done, I personally have never had the opportunity to flip a domain.
As far as selling a domain goes the best advice I can give you is look at the services that post domain sales like https://namebio.com/
Look, study and learn what sells and try to imitate that as close as possible. Forget what you think will sell and learn from what has already sold.
Welcome yes it’s a very good game when you know what your doing i have flipped thousands of domains but spent loads of time to get this as you can waste loads of money to start best have a look at what is selling and go from there but only buy a few domains first and try to sell them...