Using the JR Pass

Hello,

I'm going to Japan in late November - early December (Green Class) and mainly staying in Kansai. Also its my first time using JR Pass. So i want to make sure and ask for several things before my trip.

1. I can use the JR Pass for local trains/bus in Kansai as long as it is in JR Line, right? Is there any additional charge?

2. I'm using green class, so i have to reserve my seat only when i'm using rapid trains/limited express/shinkansen, right?

3. After arriving at KIX i have to transit in Shin-Osaka Station before continuing my journey to Ishikawa. Do i need to reserve my seat and buy the ticket "from KIX to Shin-Osaka and Shin-Osaka to Ishikawa" or is there another way?

4. Can i use JR Pass on sightseeing trains? Such as Sagano Romantic Train and Hanayome Noren. Is there any additional charge?

5. Can I order my train tickets all at once when I'm in Japan? Like its August 8 and I order my train tickets and reserve my seat on KIX Station for August 8 - 10

I wish you can help to enlighten me.

Best Regards,