Web dababase

We are aiming to develop a web based DB consisting on 6 sections where we would capture data (about 50 variables), store them and then being able to produce pdf files made of txt+some of the variables capture on the other sections. We should be able to create accounts (logins for clients) and they should see only their data. We expect to hold about 2000 accounts The DB should have 3 levels of users rights (site admin, user admin and user reader). Full specs available txs for biding