TOnce there' was a guyman who  always wishesd for somethings.

1. In a fairy tale it is almost always past tense used - this story is not happening right now.
2. Overly casual start "There's a guy" is something you'd say to point out a man at a bus stop.
3. "Something" is a specific item, while the general plural noun "things" is a broad category.

One day he was told from oneby a mysterious woman that if he sprinkle thed salts to on the magpie's taile then he cwould really get what he wishesd for.

1. "salts" = chemical compounds that include a large number of substances; salt = table salt.
2. Tale = story; Tail = end part of an animal.

When he found the macgpie and tryhe tried to sprinkle the salts on it, but he couldn't because the macgpie kept moving.

careful with tense alignment.

She, tThe macgpie, actually could speak and she talked to the guyold the man that if he wanted to sprinkle the salts on her, he had to getbring her a pocket knife.

"talk" and "tell" are two different verbs. Here she is being directive so she is directing/telling him to do something, not talking to him in a conversation.

how could he get thefind a pocket knife?

As written it sounds as if there is one, singular knife he needs to obtain - when in fact it is a general request for one kind of thing. Use the indefinite article (a) not the definite article (the).

He picked blueberries buckets and buckets. of blueberries.

He brought it to the macgpie.

She then told him she wanted a sled at this time.

"at this time" = now
"this time" - one of a sequential serie4s of events

how could he get thea sled?

Use the indefinite article (a) not the definite article (the).

He carved some toys for children, wooden spoons, and cutting boards using his pocket knife and sold all of them at the market.

She didn't get it againAgain she wasn't happy with it.

I have no idea what your original sentence means.

She said it shoud'veld have been made of silver and gold.

LIke this way She haShe asked him to get morea bigger and more expensive ones to for her.

I am not sure what your original sentence means.

Then he finall gety obtained a castle and a large amount of golds.

Gold is a singular not countable noun meaning money.

Finally Sshe dletermined him to sprinkle the salts tosalt on her tail.

But now he couldn't think aboutof anything he didn't already have.

tThe magpie flew awaym , back into the forest to wait for another man who was always wishing.

There' was a guy who  always wishesd for something.

One day he was told from oneby a mysterious woman that if he sprinkle thed salts ton the magpie's taile then he could really get what he wishes.

When he found the macgpie and tryied to sprinkle the salts but, he couldn't because the macgpie kept moving.

She, the macgpie, could actually could speak and she talked toold the guy that if he wanted to sprinkle the salts, he had to get her a pocket knife.

He picked blueberries buckets and bucketsdecided to pick buckets of blueberries and then sell them.

I have merged the next sentence with this one for achieving a better flow.

He brought it to the macgpie.

She then told him that she wanted a sled at this time.

She didn't get it againOnce again, she didn't accept his offer.

She said it should've been made of silver and gold.

LIke this way She had him to get more big andShe convinced him to get bigger and more expensive ones tofor her.

Then he finally geot a castle and large amounts of golds.

Finally She determined him to sprinkle the salts toNow she accepted to get salts sprinkled on her tail by him.

I replaced "finally" with "now" because you had already used "finally" in the previous sentence.

But he couldn't think aboutof anything he didn't have.

tThe magpie flew awaym , back into the forest to wait for another man who washad been always wishing.