I want to give players the possibility to upload their screenshots to my fan website.

I also would like to make a little bit of advertising at my fansite to get money to pay the webserver; and it would be nice to use the lotro logo for better overview (there will be also pictures of other games).

Are there some terms and conditions concerning this project? Do I need a license?

(Sorry if my English is not very good, it's not my native language ...)