steps to create game online?

OK THANKS!

I want to make a multiplayer racing game, with 3 or 5 players per game, very simple, without great graphics… I saw this example of multiplayer online Ralph ([NetRalph: Roaming Ralph goes networking)), from there I got the idea of embedding a .p3d on the web for a multiplayer game. But I think it is not good idea. Is that correct?. I did not write anything about networking, but I have examples of how to send messages to the server, and download files, and synchronize … my question was about inserting a file . p3d on a website, and then convert it into a multiplayer, like to example of Ralph. What is the best option in terms of performance? What would be the first step to build my car game multiplayer online ?

for example:

Step1: create a small application
Step 2: upload your application to a server
… …
… …

Thanks!