How do I get money for my house and furniture?

Another good way to get money is to sell fossils that you dig up, but first you have to get them identified by Blathers at the museum. Then go sell them to Tom Nook, and he'll pay you quite a bit of bells for each one, depending on the rarity level. It isn't possible to get a job in this game, apart from when you work for Tom Nook in the first part of the game.

The best way to earn money is by finding the money rock (which can earn you around 8000 bells) and to fish. Each haul can get you a minimum of around 6000(depending on which fish you catch) and it can make you a lot of money

Best thing to do is get a different fruit to what is already in your town, online etc. And plant it then then pick those and plant, till you have many trees then sell the fruits. You get 500 each or 7500 bells per inventory.

In my opinion, the best thing to do to earn money is to go fishing and bug catching in July at night. One time after about a half-hour of hunting, I sold an inventory full of rare bugs and fish, and Tom Nook bought all of it for 144,000 BELLS! I assure you, this is the absolute most best way earn money.