This is follow up to this thread.

I have few questions that i was hoping you guys can answer for me:
1. One of the wheels has slights discoloration, is this normal? (See pix)
2. Rust i see in the engine (belt poleys) is pretty much normal due to steel parts? (See pix)
3. The only actual rust i found is under rear license plate and around trunk latch, is this a concern and if so what do i do? (See pix)
4. I see some condescension inside of the both head lights, it comes and goes , don't stay put. Could be from weather and me washing it with hot water in cold (55f) garage. Normal or should i be concerned? (See pix)
5. I heard something about car seats heaters going bad and something with ignition switch going bad, should this be replaced/modified now or wait till it actually breaks?
6. I'm a big guy, does seat automatically stops when you move it back? I can press it but i feel like its going to crush something and i definitely don't want to crush anything.
7. Vehicle had trainy flush and radiator flush when previous owner bought it in 2010, since then he put on 6k miles on it. He changed oil last full before putting her to rest for the winter. Break fluid or anything else is all original. Should i replace any fluids at this time?
8. What does MDH number mean on my door sticker with my Vin#?