Help me with Moodle

I need someone who could help me with moodle. I have installed and I need the next 2 things: 1) A site to upload files to my particular students , write them and also the inverse (they can send me messages and upload files...) 2) Connect some users of a database with Moodle. People who has paid a subscription in a ecommerce must create automatically an account in Moodle with the same user and password and have access to the site of the point 1.