You may say 'kuni,' written: 国
バレリー
You may write it as: 中心
植物。It means "plants" in Japanese.
家族
ジェームス(zyeemusu)
職人
レア Rea
ガブリエル (Gaburieru)
The only surefire way to remember the Japanese characters is to write them, write them, write them. It's how the Japanese do it. Fill notebooks, use flashcards, and constantly refresh yourself on what you've just learned. Try ten characters a day!
There can be many characters combined to sound like 'Umehiko' in Japanese. 1 possibility is 梅彦 (うめひこ). There are no Chinese Characters that sound like 'Umehiko' because it is a Japanese reading. The Japanese Kanji characters above are read as mei(2) yan(4) in Chinese.
盆栽
To write in Japanese, you will need to install a Japanese IME on your computer.