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Try to learn this
https://support.solidangle.com/display/A5AFMUG/Converting+an+Interior+Scene+to+MtoA
https://support.solidangle.com/display/A5AFMUG/Lighting+a+Room
https://support.solidangle.com/display/A5AFMUG/Lighting+the+Natural+History+Museum
https://support.solidangle.com/display/A5AFMUG/Using+the+Sky+Dome+Light
https://support.solidangle.com/display/A5AFMUG/Light+Portal
What are you trying to light? Images would be useful.