The best tip to selling a game is in the first instance to make a good one.
If you want to have anything more than a dribble of buyers then it will have to be good.
If you have a great game made then you wont have much difficulty in finding buyers for it - they will be lined up ready to part with their hard earned cash.
Theres plenty of time to think about how you will get your game known and how you will go about selling it while you work away on developing your blockbuster.
Once you make it, then an all round professional presentation of the game together with some considerable effort in marketing it will provide the best opportunities for success.
Word gets around very quickly if theres something really good to be had and anyone whos interested in such products usually dont miss a great deal.
There are many articles, books, web sites including TGC sites and so on around regarding how to go about successfully making and selling games.
If you are serious about it - its advisable to study and take note of some of them and listen to others that have had considerable success.
Still the more helpful information the better.
Good luck to you all. I wish you much success in your game making endeavours.
"I am and forever will be your friend"