I'll give quick answers and you can ask follow up questions:
Tune Up really just consists of the plugs, air filter and fuel filter. You MAY still have the old style fuel filter, you'll need to update. Do a database search here on "fuel filter" and you'll get a description of what need to be done, not a real simple process. BTW you need 12 spark plugs. Air filter is easy job, plugs not too bad, can be hard to get the wires off. Brake fluid and coolant you may want to get replaced also. Brakes are easy enough to service. Tires: I like Michelin, yes.
Blower motor: If it's making a weird whining or vibration type of noise, there may be just "junk" in the blower cage, you can check it yourself yes, easy, there is a dust filter down under there too which you can easily replace.
The outside mirrors can be a bit of a puzzle, if you can get the part you can probably look at the new part, look at the truck, and figure it out.
You can get tech info for a fee from MB, I think it's at http://www.startekinfo.com/StarTek/
try that, if not you'll find it on this site.
Gilly

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