How do you make a website like Moshi Monsters?

Answer 1

Have an idea for a game.

Develop your game idea. Get other people to try out the game to see if they would like to play it. You will need to get or have an education in how to design computer games or be able to hire people who have the education and knowledge to design the game.

Have a lot of money or find someone who has a lot of money who is willing to invest in your game idea. Use the money to lease/rent/buy the buildings and equipment needed to host and run the game. Use more money to hire people to run the equipment, etc. Advertise your game and hope that it is good enough to get people interested in playing and paying for the game.