i bought a micro power pole anchor, but the pole wasn’t included. What else do i need and where can i buy it?

Just the pole - they don't include it cause there's two options; an ultra-light version and a heavy-duty version - and the same place you got the main unit...or Bass Pro, West Marine, etc.

 

Option is a spare battery pack with charger.

 

Thanks.  Which is best for a kayak, the heavy duty or ultra light?

If you're river fishing, then the HD; otherwise the UL should be just fine.

The poles are readily available online from many manufacturers. Probably run you about $100