on hashnest buy hardaware should come? If itself earns?
I don't quite understand your question. but Yes Hashnest is basically a cloudmining company run by Bitmain.
You can probably find all the information on their site itself
should arrived hardware for me ?
it's a cloud system based, they host the hardware and you pay for it, in return they offer you the hashrate you paid for
they don't sell directly the equipment you need as a far as i know, but you could ask their support for this