Ok looking at your 2 Example Links, i am assuming you wish to create a Browser Mafia Related Game. I did not even look at the previous posts, because after reading 3 i got bored and confused. Anyways, You should know Basic Webdevelopment Skills, Know PHP, Have Knowledge on Databasing(Acessing Character info,Ect), Have writing skills to create the Story line and have the events typed, Have Good 'Design' Skill to create the interface and what not, Good programs would be AdobePhotoshop for the Designing Part, but Paintshop Pro or even MS paint would be suitable for a Beggining project. Look up some books on PHP and MYSQL databasing on the internet, or find them in your local Bookstore. You also may have to look on ways to create a more user safe Game, becuase this is the internet..and there will be people attempting/Suceeding to Cheat on your Game.
this is a great answer but i have everything i need other then the skill for databasing and php ad mySQL the 3 important parts i've had a try on php but the thing is everytime i go to my local host i dont know how to view my page if i get this then i am in a very strong part and i might just be able to get a good game going