Hmmm. With regards to basics, I would start here in the repair and upgrade section:
Click me.
You can find a good selection of helpful topics here, including this very helpful thread:
Edge's Guide To Some Rolex Modifications .
As this thread is a few years old, some of the modifications may have been revised with some newer tricks that may or may not be more efficient or suited to your needs. Also, it won't cover things like swapping in a genuine 15xx movement, but usually such topics can be raised in the relevant sub forums for help and information
Anyways, this is a good place to start. I'm sorry to point you to an already existing thread, but the way I see it, there's no need to reinvent the wheel, so to speak.