The golden altar of incense was in front of the vail, behind which vail was the ark of the testimony, Exodus 30:6 and Exodus 40:5.
As to the lampstand (I prefer not to say 'candlestick' as it was an oil apparatus) the only reference I can find is Exodus 40:4 :
... and thou shalt bring in the candlestick, and light the lamps thereof [KJV]
There is, perhaps, an implication (in this particular verse) that the lampstand was placed, centrally, on the golden altar.
Is there any other scripture that would indicate more of the exact position of the lampstand ?