Some problems about Japanese.

Your trouble is unnecessary. Generally, as long as the other party knows that you are a beginner, you can understand what you mean. Just like China people, you will try your best to think about what he said.

The Japanese in our company can understand. They say that many people in our company speak Chinese, but they can understand it. However, words like auxiliary words should be careful. If it is wrong, the meaning will be completely different. For example, in the sentence "でべますをべます", the former means eating with chopsticks, while the latter means eating with chopsticks. So be careful, or you will make a joke.

Generally, the word order of Japanese is different from that of Chinese, but similar to that of English. Adverbs can be placed in different places without changing the meaning of sentences.

Like the questions you mentioned below, if you practice more and use more, there will be no occasion to say thank you as good night. Language is practiced, not learned.