As a trap card, you cannot activate it on the turn you Set it. However you can activate it in any turn after that, including your own, if you wish.
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The effect of Call of the Haunted that destroys the monster it summons, is not something that 'activates'. Because it does not activate, there is nothing for Stardust Dragon to chain to.
Yes! You can activate Call of the Haunted to get a monster in the same position from your Graveyard as it was when destroyed. That will allow your monsters to protect you and keeping your life points safe
No part of Call of the Haunted or Royal Decree affect a monster's ability to attack. The Sangan will be able to attack as normal.
As a trap card, you cannot activate it on the turn you Set it. However you can activate it in any turn after that, including your own, if you wish.
Call of the Haunted will resolve first, summoning Sangan. Mystical Space Typhoon will resolve second, destroying Call of the Haunted. This in turn will destroy Sangan. Sangan will start a new chain with his triggered effect and search for a card of 1500 ATK or less.