Used 6th axis robots on ebay

Thinking of purchasing a used 6th axis robot arm on ebay.

What should I be looking out for? Can i just buy any robot arm and read a manual and figure it out? I have no prior experience with robots or robotics but I can certainly figure it out. Do these robot arms have to come with a controller and a power box? Or is it just the robot it self.

Go gentle on me I have no idea what Im talking about and will take any advice

Thanms

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