Don't worry - there is no way of doing a rite correctly . . . they just make it up ;-)
• Make sure you read the rulebook on Speak with Ancestor again and again - highlight the relevent points and make sure you hit them (time, spellcards, format of THE question *Hint-hint*)
• Make it appropriate to the Ancestor you are speaking to (background/source material/research results linked to the speak with Ancestor should be available beforehand for the ref to read
• Speak clearly - Ancestors often have "Voices in their head"
• Relax, enjoy yourself and make sure that everyone else involved in the rite has fun too (sorry - can't tell you HOW to be entertaining)
That is all OOC advice - for IC advice, have a chat with the Incantors. (and one last tip - don't EXPECT to get Harmed in the face - try expecting something else) ;-)
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The Infamous Fozzy