HELP - as3 engine

Hello to all.
This is an outstanding website, thank you all for the help…

Right now i have a trouble.

I need to do a work for the university but i really dont know how to !!

I will try to explain:

I need to do a Football (soccer) Field with all the 11 players on it.
I will use Drag-and-Drop to put them on the field.
Then i need to save the tactics that i made with the players, all the 11 coordinates from the players must be save, because i need to do several tactics and save them all.
Next step is when i want i can load them again.
How can i do this ???

My teacher gives me no indications at all, and says that my research is the most important thing.
He also says that i need like an engine to do this…
The only thing he told me is to look in XML…
I also feel like a clown at him right now because i have got nothing to say to him.
You must HELP me guys you’re my only HELP

GREATINGS FROM PORTUGAL