Thanks for asking this question
jehocu03, thank you for asking this question. I recently stared riding and looking to do some of the longer rides possibly a century this year also. I live in St Cloud, MN and I feel like I'm the only newbie rider in this city. I have found that doing the rails to trails and some of the rural hilly roads are helpful for me. I guess that doesn't help you in Minneapolis, good luck on the that one.
I've picked up really good information here for the endurance training part from all the responses that you recieved. Good deal.
As for the journal part of it, I've been using http://www.mapmyride.com This site keeps track of a lot of information in one place. I like it because you can actually keep track of your trips on a map and review them later. A little setup work but really easy to use and the information is always available.
Keep up the good work with the training and good luck with the century.