Welcome to The HUBB. Sounds like a fun, ambitious first trip.
I gather you're researching Bhutan, but it's not clear whether you've looked into the awkward and expensive issues riding through China (including Tibet), or the famously unpredictable Turkmenistan visa, or land entry into Azerbaijan, or even the near-impossibility of non-Indian nationals purchasing a bike in India.
I'm no expert, but I'm aware of all these issues being addressed relatively recently on The HUBB, so you might start with site searching and/or methodical reading of posts and trip reports. It's all here, and the more foundational knowledge you have, the better you'll be able to formulate specific questions. Asking for "any advice I can get on...visas," for example, is a bit vague.
Hope that's helpful.
Mark
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