The hiragana, and katakana syllabaries are the best first step towards learning the Japanese writing system due to a few reasons. The two syllabaries are relatively short at 46 characters each, not only that but they are easier to write than kanji due to the fact that you will not find a kana with more than four strokes total. Aside from two characters the correspondence between sound and the character is one-to-one. Lastly each syllabary encompasses all the sounds present in the Japanese language, meaning that any available text can be written completely in kana. (Which is what happens with books for small children)
There are two principles which govern the sequence and direction in which kana and kanji strokes can be written.
1. From top to bottom
2. From left to right
Stroke order is easily identified in reference books by the small numbers placed at the end of each stroke included in individual kana and kanji. This indicates the sequence of the strokes starting from 1 and ending at however many strokes it takes to finish the kana or kanji.
Japanese is handwritten, not on lines like in the west, but (even for adults) in a printed or most usually imaginary grid of squares. When one learns how to write kana and kanji, it is recommended that from the beginning you use Japanese manuscript paper (Genkō yōshi 原稿用紙) . At the very least it is suggested that you trace over the grey-tone characters in practice books to get a better idea of the proportions required for each kana and kanji.
( ´•౪•`) こゆうきあいはら (^◇^；)