Here some of the ways you can try..
> online surveys
> micro-tasks
> freelancing
> selling stock photos
or you can just participate in giveaways to get some extra cash !.. here are some of them which are worth $500 hundreds of dollars. follow this link:
linktr.ee/iveawaysNGifts
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
I'm Afraid you can't :( Except earn them xD why not grow a money tree?
keep saving up
Earn it.
That question is too specific. I'd recommend asking one of the following: How do I recover 'errored' money transactions on AC Wild World? What should I buy to earn big on AC Wild World? How do I earn money on Animal Crossing Wild World?
Pretty good! They are at the side of your hair and come in different colors. Earn them By donating money to boondox at the town hall. Have a nice day! 
You can't sell weeds for bells (money) on animal crossing but you can sell flowers, furniture, clothes and fruit that you shake off the trees for money at Tom Nooks store. If you pick up a weed it should dissappear unless it is a dandelion then it will be stored in your pockets screen. The money you earn can pay off some of your mortgage at the town hall.
Collect stuff, sell to Tom Nook, repeat.
sell fish, bugs, shells and fruit
Well there are many ways to earn money so there's how: 1. Shake trees with no fruit but be carefull some have bees and they sting heaps ( well for your avatar on animal crossing that is) 2. Shake fruit , catch bugs or fish , pick flowers , help your animal friends or look inside the recycling bin. Then sell them to Tom Nook and get MONEY! There are few ways to earn Money.
you earn money and get a good that you helped an animal out