1)
Once I have played Sacrifice of Form with Crown of Flowers and I Twilight CoF away, what happens with the items the Wizard had held? And can I play another Wizard or do I have to reveal the same avatar each time?
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If Sacrifice of Form is discarded, all items placed off to the side with it are also discarded. After SoF is played, you may not play a different Wizard and your opponent may not play the Wizard you sacrificed.
it would be nice to include the question regarding CoF and SacForm. Like this:
1)a)
Can i play play Cof with SacForm so i could later twilight it and play a second SacForm?
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Yes, if all requirements for such are met, it is legal.
1)b)
Once I have played Sacrifice of Form with Crown of Flowers and I Twilight CoF away, what happens with the items the Wizard had held? And can I play another Wizard or do I have to reveal the same avatar each time?
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If Sacrifice of Form is discarded, all items placed off to the side with it are also discarded. After SoF is played, you may not play a different Wizard and your opponent may not play the Wizard you sacrificed