The road map is good. Its been a while since i''ve played the game. Also, another thing I forgot to mention in my earlier posts was not to stock up on uneccesssary items. During the first few missions I loaded up with rockets and small health packs, and when i got to the later missions I had no way of removing them. The only way to get rid of unwanted items is to load up a side missions add the items to a character you want dead and kill them.
Also, I really feel that using your guns for the first few missions is the best way to go and then when you reach mission 10 or so , just stick to rocket launchers.
You can do that if you like. You do not have to write out a anything big but if you feel like creating a roaddmap, they are fairly easy to construct. If you want go ahead and make a draft, and I will proofread it for you if you like. Also like I said, anything you would like to see in a level guide let me know.