Multiple electrical issues

Hi everyone, I’m new to Titantalk and a first time Titan owner. It’s a great ride with plenty of power. I just got my 2007 king cab SE model 4x4 off road. It has 187k on it and I want to run it to 300k. Here’s a list of issues: when I test drove it the 4x4 worked, now the little light in between the front and rear wheels on the icone is all that lights, the front wheels don’t light up for 4wd hi. 4lo just keeps flashing and never locks. I’ve tried all variations like driving slow or in park or neutral. Also, the back up sensor doesn’t work, horn is intermittent, no cruise control or steering wheel radio controls, and the manual transmission shift option doesn’t work. Do I have some kind of electrical issue where all of these things are connected? Lights on the dash are airbag light and tire pressure light. There are no other lights while driving and they all come on when I first turn the key. I’m ok with fixing some issues 4x4 is most important. Got it for $3,800 and the frame and body are extremely clean which is great for me in upstate NY. Any help with these I really appreciate. Thanks!