I suggest that you find some resources for learning the hiragana, katakana, and kanji. There are the three writing systems used in Japanese. You will probably be best off to buy a small beginner book in Japanese and let LingQ be an additional resource for you.
People all learn in different ways. We have members who learned from scratch only using LingQ while others need more help.
Some lessons have Romaji, and there are even some lessons written in Romaji, but our system only works with text written in the normal fashion, with hiragana, katakana, and kanji. There are no lessons with the Romaji or anything else under the text. Our text has to be in the target language, in all languages. That is how the system works.
I suggest you choose a beginner lesson here at LingQ, and listen a few times. Refer to the Romaji to help you. Look up individual words in the Japanese text, and try to get a feel for the language. Do not be frustrated by all the things that you do not understand at the beginning. Just keep at it and you will improve. Your knowledge of Chinese will help you acquire a large vocabulary faster than someone with no Chinese since about 50% of Japanese words are of Chinese origin.