Lawn treatment

I will soon be about to use my new Varicutter and would appreciate any recommendations re height to set it etc, as I am told they can be brutal if used unwisely. Also, I was wondering if I need to use a moss killer before hand? And finally what lawn food is good for strength and colour? thank you.
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https://www.lawnsmith.co.uk/topic/scarifying-raking/verticutting