1. You can create a simple login page (with or without database connection). If without db, then use txt file to save data (but is limited to small number of users only). After successfully login, redirect user to upload page.
2. Unless you want to upload file to database, you can uploading file directly into folder without a database running on your machine.
3. You propably need to install mysql on your server to run database. Also install phpMyAdmin for better user interface.

P/S: not good enough to comment on FTP side. sorry!