Looking for a good online database

Im relatively new to the web codeing world, however i do understand enought html to do some basic to intermediate functions. My question is im looking for a way to organize lots of information into a database of sorts, the database will allow users to search it and seperate out entrys based on different factors, each entry can be clicked on which will take the user to another page with more specific information concerning that entry. Three important features in this "database" are it must be able to incorporate pictures with each entry, users need to be able to comment on each entry and have comments posted in that entry about that entry, and finally it must be free or close to it! i know its asking alot but im hopeing somebody has heard of something that will match my needs closely.

Thanks,
John