Japanese writing system consists of Hiragana, Katakana, and Kanji. Each have their own style of writing and Hiragana and Katakana together are referred to as 'Kana'. It's believed that Kana in general are taken from Kanji symbols for ease of use by ancient Japanese natives. Kanji hails from the Chinese language of old times and have been inserted into Japanese through cultural exchanges.
Writing kanji is relatively the most difficult of the three; Hiragana characters are curved and easy-to-write, Katakana have more consecutive and straight lines rather than curves. But kanji has all sorts of lines and strokes, which are called 'kaku' and more complex kanji are know by their various "radicals" (部首 'bushu') which most of the times have separate meanings. The order of drawing strokes is an important factor in Kanji drawing. This order almost always follows two simple rules, first vertical lines then horizontal ones, and always from left to right.
バレリー
You may write it as: 中心
植物。It means "plants" in Japanese.
ガブリエル (Gaburieru)
家族
レア Rea
職人
ジェームス(zyeemusu)
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!
盆栽
To write in Japanese, you will need to install a Japanese IME on your computer.
The hiragana (basic Japanese characters) is とも, and the most-common kanji (characters originating from China) is 友.