Right, that is probably the best starting point right there.
Get Joel Friel's The Cyclist's Training Bible. It's like $25, and you can probably find it on sale for less (which is less than the cost of one race registration fee). IF you read it, it will be the best cycling related money you have ever spent.
Coming on a forum and asking about how much to train for a racing season is a little bit tricky because we are all at different levels. So go with read Joel Friel's book and it will help you SO much more than this forum will. No offense BF.