The main thing is to speak to her of you fantasies and desires. Talk to her about what turns you on about it and what you fear about it, etc. Shared intimacies and secrets are what build good marriages. She may not be into it and may never be comfortable acting on it, but there is really only upside to her knowing all about it - so speak to her!
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Communicate communicate communicate!
Start slow, be open and honest and if unsure about something ask questions or research together.
Advanced - Role play....