Not only I don’t I have that kind of money.

You were really close here! When you use this construction, you switch the subject and the verb.

But he toldgave me a very strange answer about Kungfu.

I throughink Kungfu is teaches you how to punch someone beautifully.

I have a realn amazing co-worker.

When he getbecomes interesting oed in a new interest.subject,

this is not a complete sentence, so I've combined it with the next one.

H... he will become so addictive andthat he'll put all his money and time into master such interesit.

For example,

Bicycle.

Not necessary

He go...he bought 6 bicycles and, each one the price was above USf which cost over $10,000.

At the same hHe won a lot of trophies too.

Not clear if the trophies are related to bike riding or from something else.

THe is also interested in tropical fishes.

Only tThe fish tank was already above USalone cost more than $10,000.

Not only I don’do I not have that kind of money., but

I combined this with the next sentence.

I also won’t be sucho devoted too it.

But hHe told me a very strange answerstory about Kungfu.

the word "but" cancels a previous thought, which I don't think you did, so I deleted it.

InFrom Kungfu, he learned how to manage his life.

And here I throught that Kungfu isonly teaches you how to punch someone beautimasterfully.

I have a really amazing coworker.

People commonly use “real” as an adverb, but it’s a bit more proper to use “really”.

When he gets interesting on a new interestin something new, he becomes addicted and puts all his money and time into mastering that thing.

What you wrote is not a complete sentence; I combined it with the following sentence you wrote.

He will become so addictive and put all his money and time to master such interest.

FTake bicycles, for example.

Again, this needs to be combined with the next line.

Bicycle.

He got 6 bicycles, and each one thewas price wasd above US$10,000.

At the same hHe won a lot of trophies, too.

THe is also interested in tropical fishes.

Only tThe fish tank was alreadyalone cost above US$10,000.

Not only I don’t have that kind of money, but I would never be so devoted, either.

I won’t be such devote too.

But hHe told me asomething very strange answer about Kung-fu.

InThrough Kung-fu, he learned how to manage his life.

I throught that Kung-fu is teaches you how to punch someone in a beautifull way.

When he getbecomes interesting oed in a new interest.

We say "becomes interested" to show "starting a new interest".

He will become sos addictived and puts all his money and time into master suching that interest.

He becomes. He puts. Addictive is describing like a drug. Addicted is how you describe a person. Use "into" instead of "to".

Tropical fishes.

adjective for tropic is "tropical" and it's one fish, three fish, ten million fish.

Not only I don’t't I have that kind of money.

when you say "not only...." then it's "don't I have". This is difficult.

I won’uldn't be such devote tooeither.

wouldn't is for "what if" and won't is for "real". "either" because not-only in the previous sentence.

I "throught" Kungfu is teach you how to punch someone beautifully.

Looks like a typo error?