Translation from the meaning of your English

我应该学习音，是不是？

我应该学习音，是不是？我觉得这个很硬。如果我说无音中国人不会理解我? 我能说音于一个字， 但我不能用音于多字。 Chinese tones is very hard to learn. 中文声调很難去学

I can say one or two words using tones. 我只能用声调說出一兩个字

But when I'm reading texts or speaking many words I can't use tones.但閱讀或說多辞句时, 沒有法子說出声调

My speech becomes very slowly. 我說得慢吞吞 (more natural, literally I spoke excruciatingly slow)

I think if Chinese hear my speech with tones, 当一个中国人听到我說中文 (same reason, lit. When a Chinese listened to me speaking Chinese)

they will laugh so hard. 他们会笑倒

Should I use tones? 我該学声调嗎? Not unless, you want to communicate orally.  A slight change in tones will change the meaning drastically!  Like in English, a misplaced comma!  If you dispense with the tones, you just have to contend with Chinese who don't speak Mandarin - write on paper!

It seems meaningless for me. 它们对我没有意思.  Then it would be similar to learning Russian using the Latin alphabet instead of the Cyrillic one.

我应该学习音(声调），是不是？

我应该学习音（声调），是不是？我觉得这个很硬（难）。如果我说无音（不说声调）中国人不会理解我? 我能说音于一个字（一个字的声调）， 但我不能用音于多字（把声调用于多个字上）。 Chinese tones is very hard to learn. I can say one or two words using tones. But when I'm reading texts or speaking many words I can't use tones. My speech becomes very slowly. I think if Chinese hear my speech with tones, they will laugh so hard. Should I use tones? It seems meanigless for me.

Chinese tones:汉字的声调。      hard：难的

我应该学习音，是不是？

我应该学习音，是不是？我觉得这个很硬。如果我说无音中国人不会理解我? 我能说音于一个字， 但我不能用音于多字。 Chinese tones is very hard to learn. I can say one or two words using tones. But when I'm reading texts or speaking many words I can't use tones. My speech becomes very slowly. I think if Chinese hear my speech with tones, they will laugh so hard. Should I use tones? It seems meanigless for me.

语调能更准确的表达一句话的意思，看起来一模一样的句子，读起来语调不一样，表达出的意思甚至可以完全相反
多加练习你就可以说得很好的 

Chinese tones is very hard to learn.

中文的聲調很難學。

I can say one or two words using tones. But when I'm reading texts or speaking many words I can't use tones.

我可以配合聲調講出幾個字，但當我在朗讀文章或是演講時就沒辦法配合聲調了。

My speech becomes very slowly.

我講話變得非常緩慢。

I think if Chinese hear my speech with tones, they will laugh so hard.

我想中國人聽到我用聲調講話時，一定會笑得很大聲。

Should I use tones? It seems meanigless for me.

我應該配合聲調嗎？對我而言，好像意義不大。

p.s. It's quite important using tones in Chinese.

      Different tones express different feelings, even the same word.