Unclear how thoroughly you've looked into any of this, or what your prior experience has been. Unclear also what your nationality might be, which has in the past made a big difference at (especially) the Venezuela border. Snakeboy gives good advice in a nice, non-sensationalist tone.
If you're inexperienced or un-researched, best take some time and look into (again especially) the Venezuela and Brazilian portions of your trip. Read some ride reports and pay attention to visa requirements, road conditions in the Amazon basin, medical issues--including but not limited to yellow fever inoculation--and more like that. You can buy what you need in Bogota, but I'd definitely bring boots and riding pants as well.
Once south of the Amazon basin if you go that way, everything becomes much more straightforward, with paved roads, signage, and other infrastructure.
Asking questions more specific than "Anybody have advice or tips for the road...?" will likely attract useful answers. Reading books and online reports from others will help narrow it down.
Hope that's helpful.
Mark
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