the racing aspect i can't help with, but the rest is pretty much where i started last june. i was overweight and out of shape and inspired by toronto's bike week promo program-- which is the point, i guess. i bought a bike and accessories and started biking to work and loved it. i'm still overweight -- but working on it -- and biking 2000 kilometers last year certainly improved my fitness level.
so, to address your questions...
Any advice on how to begin the journey back to fitness and being a really great cyclist in my own rite? I have a tentative goal to at least be able to participate in a 25-mile race this June. Do you think I have time to get ready?
i started off by cycling work 3 - 4 times a week, 21 kms each way. interestingly, they say biking is the fastest way to improve your fitness level. after a month or so of biking i was feeling much better about it. if i'd set my mind to it and worked for it, i'd say five months would've been sufficient training time for a 25-mile race, even starting from scratch like i did, and like you would be. i think if you decide this is something you want to accomplish, you'll be able to. in my limited experience, and being a commuter/just-for-fun cyclist, the mental aspect is always more challenging than the physical... meaning, at five in the morning your bed is way more appealing than your bike. i've never raced, but as far as i know the important thing is to ride as much as possible. make your saddle more comfortable than your couch, and enjoy the view between your handlebars!!
I used to dream about ice cream, Antonio Banderas, and daquiris on the beach. Now, i dream about fresh pavement...