Non ci sono prenotazioni da fare, non si paga nulla per entrare, posteggiare è purtroppo molto complicato, ci sono semplicemente pochi posti e molti visitatori.

It's free. Parking is free, too. I'd say you need from one hour to one hour and half. You might want to extend it and take a walk around the campus. The Visitor Center is located on the north side of the SR 520. The old campus is located on the other side. You can drive to the old campus in 5 minutes. Enjoy !

The tour is free. Visitor parking is free as well. The tour is not too long maximum 1.5-2 hours. Have some time reserved to walk around the Microsoft Commons campus.

You can do it in as little as about, or as long as 3. There is the history of MS, technology, and current products to get your hands on

I wish I could give you a definitive answer, but I rent cars on vacation with my family. Best thing to do is go online and type in 'king county metro' and have a look at where they go in the Bellevue / Redmond area. I wish you well. Hopefully a local will be able to answer better than I. Also, if you are interested in computers, don't forget the Living Computer Museum, started by one of the founders of Microsoft, and much closer to downtown Seattle! Good luck, I know you will find a way to get there, Seattle is very 'transportation conscious'.