well my mountain bike is worth 3500 but i didn't pay that much, its called connections. My road bike is worth around 4000, but i got it all at cost!
trainiing wise i would start riding 2-3times a week. the goal is just to get out and have fun. Once you get a record of having fun you can stop having fun and start enjoying the pain!
I was quoting usd give me a ring 1-800-489-8430 and ask for rob i'll hook you up all said and done for $20.
The computer is only there to tell you how many miles youve done and how fast your goign. its ment to encourage you only.
Once you get riding for a few weeks on a regular baissi you can start goig for longer rides and more often. the thing is to build up the base of fitness which you might not have. If you over do it at the start your gonna want to stop so take it easy.
fire away more questions dude!