One Wiki to Rule Them All
http://http://lotr.wikia.com/wiki/One_Wiki_to_Rule_Them_All
For more discussion and debate, you can check out the Lord of the Rings Wiki: One Wiki to Rule Them All.
Tolkien Gateway Mainpage
http://tolkiengateway.net/wiki/Main_Page
Students can find well-referenced information about all things Middle-earth on Tolkien Gateway.
An Interactive Map of Middle-earth
http://lotrproject.com/map/#zoom=3&lat=-1315.5&lon=1500&layers=BTTTTT
Bilbo's route is outlined in blue, and it should be easy for students to follow it! Encourage your class to revisit this map and examine it in detail as you read further into the text.