How do you make a free virtual world

Well you could animate it, or play a world kids tweens and teens would play Oswald ,meez sparkleworld(16 and up). But to make a world think of ideas and you will need to avertise it or put in on the internet. Step #1 Think of ideas Step #2 avertise it step #3play or make it up.Remeber don't use any thing bad for a game if you want people to play it for a world alway make some really good rules and make sure they follow them good luck sorry but,dont use blood , bad words,any inoprottet thinks like the s,b,f,s word