You can do two things. Easiest one is to download ROM manager, allow it to flash clockwork over SPRecovery and select what you want from the list of ROMs, it will do the rest for you.
The other way is to use SPRecovery(or Clockwork)to fkash them yourself. Download the ROM on your computer, transfer it to your Droid through the USB. Just drop it on the phone, not in any folders, and rename it "update"(doesn't have to with Clockwork). Disconnect, then power down. Hold X and power up. Make sure you select both Wipe Cache and Wipe Data. Go down to install update, then hit allow update.zip, then install update. Wait for it to finish, then hit power once then reboot. It'll be flashed with a new ROM. Since it is Froyo you should get most of your apps back. For txts you can get a backup app that'll back those up before you start.