Habbo-like chat

Alguien habla español? Nadie? ok…

i’d like to do a simple habbo-like chat in flash. here’s my idea:
nothing it’s as advanced as habbo, just a chat that also includes having a character and moving around. kinda like [url=“http://www.chatpinguino.com”]this. i think i can work on a script that moves tha character and makes it talk and stuff; these are my doubts:
-is enough a php that gets the variables of a single character, writes them on a txt and then read the txt that also have the variables of the rest of people online and retrieves them to flash, and so the flash can represent the rest of the people online???
-how do i manage to put in scene as many characters as people online?
-will the previously mentined php file require high php knowledge?