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1)Unrevoked 3.x is to root your phone and it also installs clockwork mod recovery (to make backups/flash other roms), and then Unrevoked Forever is to make your phone S-off (So you can flash themes and change the radio)
2)Clockwork will be installed with Unrevoked 3.x, and can be reached by holding the volume down button and power when the phone is turned off. (Choose recovery from the hboot menu) Side Note: You don't use the touchscreen in the recovery menu. use the volume up/volume down keys to navigate, click the optical mouse button to confirm, power button to go back a screen.
3)For a sense based Rom, I use Sky Raider. It is fast, updated often, and is hacked so you can watch hulu. If you prefer a vanilla type rom (Like on your D1), then I go with Cynogenmod. One deciding factor is that if you play emulators, you can not use a wiimote with Sense based roms.
4)To switch roms (after running unrevoked 3.x and unrevoked forever), move the zipped rom file to the root of your SD card, shut down the phone, hold volume down+power until you get a menu with a white background (Hboot), choose recovery, wipe data and wipe cache, then choose install zip from SD card. After about 5 minutes, your phone should boot up with the new rom running.
5)Yes, you would flash a stock rom, and then use the unrevoked forever tool to make your phone go back to S-on.
Also, once you have clockwork mod recovery installed, you can make backups of roms and then switch back and forth as your needs change. Just clear data and cache, and then choose restore. If you use the app Rom Manager, you can even name the backups to keep better track of them.
Good luck and happy modding!