No problem with a noob question.
Roads have no effect on command/communications in these games and if you are playing with the default supply rules no effect on supply also.
However if the scenario you are playing using the Virtual Supply trucks optional rule (and many scenarios do) then units that are located close to roads receive more supply and units in difficult terrain receive less supply, see the rules for more detail and also see the VST text in this article.
www.theblitz.club/message_boards/showthread.php?tid=70586