New Zealand has never produced a 50 Shilling coin/note.
There were no 1936 New Zealand Shillings minted.
New Zealand has never issued a 20 Shilling coin.
The Maori warrior on the reverse of the New Zealand Shilling does not represent a particular individual. All New Zealand coins have a uniquely New Zealand image, or something relevant to New Zealand history on the reverse. The reverse of the New Zealand One Shilling coin shows a crouching Maori warrior carrying a taiaha.
The last New Zealand Shilling containing any silver at all, was minted in 1946. From 1947 onwards, all New Zealand Shillings were made from a copper-nickel alloy. The last New Zealand Shilling was minted in 1965. The 10 cent coins that replaced them had ONE SHILLING marked on them in 1967, 1968 and 1969.
For a valuation on any New Zealand banknote, the denomination, design, Chief Cashier and/or Governor and Serial Number would need to be known.
The value of NZ coins varies widely, and you will find a book listing these at most coin and stamp dealers.
A New Zealand 1965 Shilling (Proof), does not get a valuation in any catalogue. There were only 10 minted, so that puts into the category of extremely rare and therefore unattainable. A New Zealand 1965 Shilling (Proof like), uncirculated and in absolute mint condition could fetch up to $10 NZD. There were 25,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
There were twelve predecimal Pennies in a Shilling, as used by many of the British Commonwealth countries. The British Shilling converted to 5 New Pence at the changeover to decimal currency. The Australian and New Zealand Shilling converted to 10 cents at the changeover to decimal currency.
A 1931 Bank of New Zealand Ten Shilling note (serial C), in very good condition, might fetch anything up to $475 NZD.A reputable coin dealer will be able to give a more accurate valuation.
With the possible exception of traders tokens (with the traders business name on them), there were no "New Zealand" Shillings minted prior to 1933. Any Shillings circulating in New Zealand prior to 1933 would have been mostly British Shillings and some Australian Shillings.
The cast of Miss Universe New Zealand 1988 - 1988 includes: Jude Dobson