Hey guys, so I bought "new" car, 1997 Toyota Camry XLE, with V6 engine, just like I wanted

, so I'm staying with Toyota Nation. But it has some problems, and it's a little dirty inside, previous owner wasn't vary clean I suppose.
First of all, ABS is not working and Traction control too. He said that there could be problem with ABS computer, and it may cost alot. I hope it's just a sensor, but if it's computer. Is it true that the fix is pricey?
#2 Lights on the gearbox are not working. What could be the problem? If the bulb is burned out, what kind of bulb is there?
#3 Lights on the speedometer and are not working, good thing at least one works, so I can see my speed at night

Also light on HVAC are not working. Same question, what could be the problem and what bulbs are there, in case I need to change them?
#4 Stop light on a spoiler is not working too

. I don't think that light is burned out, it's probably connection problem or something else...
#5 What are best ways to eliminate small spots of rust? The car has one on the trunk.
That's it for now, if I find something else I'll let you know
Oh, one more question: it has security thing near the traction button, what's it for, how to use it?