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I was thinking I will target the wavy 20, the incuse 2000 50c and even the $1 mule. I know my odds are pretty low but I just wanted to know peoples strike rates with these coins and weather they are good to start with
I'd say very, very low. I'm still trying to get both the incuse and wavy, and I've been collecting coins for over 20 years. Granted, I didn't do much noodling during this period, but even with the massive amounts of noodling I've done this year, I still haven't found any.

Nevertheless, I don't get bored, because there are so many other exciting coins to find:

For 5c, try collecting all the different reverse/year combinations

For 10c, try collecting the 1999 large obverse, plus all the
Cud and die fill errors (usually involving the lyrebird's tail)

For 20c, try collecting the 2004 large obverse (pointy "A"), the 2007 thick and thin "7", the 2008 gap, and the 2010 bubble

For 50c, try collecting the 1970 tilted "7", the 1979-1980 double bars, the 1994 wide date, the 2001 thick/doubled letters, the 2005 WWII boot
Cud, the 2010 CoA rotated, both 2012 bubbles and the 2014 bubble

For $1, try collecting the 1996 Parkes rotated, the 2001 CoF rotated, both 2003 Suffrage reverses, plus all the
Cud errors (bunny ears, spew roo, poo roo,
Cud on the 1,
Cud on the top kangaroo's back)

For $2, try collecting all the coloured releases
Also keep an eye out for key dates:

5c: 1972

10c: 1985, 1991, 1997, 2011

20c: 1995 United Nations, 2001 Bradman, 2001 CoF States/Territories

50c: 1985, 1991 Ram, 1993, 2001 CoF States/Territories

$1: 2014 MoR, 2015 ANZAC

$2: 2011, 2013 Coronation (Purple), 2014 Remembrance Day (Green), 2015 ANZAC Day (Red), 2015 Remembrance Day (Orange), 2016 Olympics/Paralympics (various colours)
Also keep an eye out for NCLT (non-circulating legal tender), and if you're really desperate, try to noodle a complete set of circulating NZ 5c, 10c and 20c coins dated 1967-2005. If that's too easy, you can always move on to Thailand, Malaysia or Fiji!

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When I go to the bank do I ask for coins in rolls or won't that matter?
It depends on what you're after. The bags often contain foreign coins that won't fit into the rolls, but the risk with bags is that you'll get someone else's rejects, which isn't good if you're trying to keep accurate statistics. The rolling machines also tend to be quite harsh on the end coins, so you'd better hope that the coin you want to collect is in the middle of the roll. If you're trying to keep accurate statistics, I would recommend rolls, but if you're trying to complete your collection as quickly as possible, I'd recommend bags.