Help on Website Plz!

Hello guys! Im not really in into building Website. But for the sake of my assignment at college I really have to build one in Plain HTML.

The website has to have a sort of database. like a simple database for their products, feedback form, and log inn facilities for members etc… D@mn I dont know how to do all this…
Is there any here whos familiar with those kind of things? Help plz! (IM PRETTY DUMD) so i really need your help.

Thanks guys in Advance!