First of all, there's no points. Bells is the currency. To earn them, you can sell things, catch fish and sell them, get fruit and sell it, get the idea? Basically, sell things.
Yes.
keep saving up
Earn it.
I don't know about Zelda hair and hat but I do know that you can get links hair and hat. You can get it by earning points at nooks shop. He has a little green machine in the right hand corner of his shop. It tracks your points and then when you earn enough you can exchange them for different presents from the machine. You can earn points by checking into the machine and by buying items in the store. You get 3 points when you check in.
On some days in Animal Crossing Tom Nook will say he's having a sale where you get 5x the points you usually get
You need to get 5,000 Nook Points.
The point system is the little machine in the store that keeps track of what you buy and gives you points for every purchase. You gain 1 point for every 100 bells you earn. If you get enough points, you may get coupons or trade in your points for special prizes.
Collect stuff, sell to Tom Nook, repeat.
sell fish, bugs, shells and fruit
You don't. You earn money and get upgrades, that's all. :D
no there are 6 different feathers you earn them by donating money
the most expensive things