Creating Script PHP + MYSQL

1)Change language button flag to choose English language and Brazilian Language. 2)Integrate automatic paypal payment system on my system, so the payment goes as confirmed release my product on time. 3)A points system for indication people. If a person (A) buy a product, and indicate to another person (B) who also buy. The first person say (A), earned some points. And being able to redeem for products. OBS : the database in MYSQL of my service is already ready, then it is necessary to make some settings the service.