What value of nMinimumChainWork and powLimit should I choose for my altcoin?
how to calculate this parameter, i little not understand. It's not block in blockchain, how find this value if altcoin exist end i update sources with exist blockchain end for new blockchain.


Because this is a new chain, the minimum should be zero.


  end about this value , how it convert to diff xxx for understand what diff is it. example diff 1, 20, 1000 etc...


It is diff 1, by definition.