affiliate system

[login to view URL] look at this link , all explain about it that's is a ward system ( affiliate system ) the user 1 will buy a product with price such ( 75$ ) and he will invite 2 user ( 17 , 2 ) every one will buy the same product if the two bought the product , the user 1 will take a ward ( such 30$ ) the user 17 will invite another two persons ( 25 , 18 ) they will buy the same product if they bought the user 17 will take the same award 30$ and the user 1 will take 30$ also etc >> if the tree cpmplete like the link , that mean user 1 will award 210$ ---------- i waana to make this system , every user i'll add them in the admin area no user will sign up user in the front end , will see they tree only , and they award nothing more every user can take a ward from specific level ( if the level is 10 , that mean the user can take from 10 line under him ) ----------------