Hi, welcome to JustAnswer!. This is Ed.
On the surface, it sounds like you have a Central Timer Module/ CTM problem. CTMs control a great many accessories in your Dakota, including interior lighting and key-in chime in addition to exterior lighting and horn. Other things are also included once you roll the key on, but I'm not sure if your Dakota even runs at this point.
Try this. A reboot of the CTM often restores it to operating even if only temporarily. Let's disconnect and reconnect it to see if anything changes.
You'll find the CTM in the recess behind the left kick panel - the area directly left of the park brake pedal.
Remove the left door sill plate by pulling directly up (it unsnaps). Then yank the kick panel toward you and it'll come right out. What sits there with three connectors pointing toward you is the CTM. Unplug all three connectors, wait a minute, and reconnect. If the systems that you have lost are suddenly restored, it means you need a CTM.
If this doesn't work, let me know and we'll press on.