The important things you should know before you learn how to write Chinese, that is principles of formation for Chinese word.
Chinese word have very long time history:
Here is some example about principles of formation for Chinese word:
Pictograms make up only a small portion of Chinese characters. Characters in this class derive from pictures of the objects they denote. Over time they have been standardized, simplified, and stylized to make them easier to write, and their derivation is therefore not always obvious.
Also called simple indicatives, this small category contains characters that are direct iconic illustrations.
Also translated as logical aggregates or associative compounds, these characters have been interpreted as combining two or more pictographic or ideographic characters to suggest a third meaning.
Also called borrowings or phonetic loan characters, the rebus category covers cases where an existing character is used to represent an unrelated word with similar or identical pronunciation; sometimes the old meaning is then lost completely. People always read poem was find out from long time ago by using rebus to help them understand and reading.
Semantic-phonetic compounds or pictophonetic compounds are by far the most numerous characters. These characters are composed of two parts: one of a limited set of characters (the semantic indicator, often graphically simplified) which suggests the general meaning of the compound character, and another character (the phonetic indicator) whose pronunciation suggests the pronunciation of the compound character.
The smallest category of characters is also the least understood.which had similar Old Chinese pronunciations and may once have been the same word, but became lexicalized into two separate words. The term does not appear in the body of the dictionary, and is often omitted from modern systems.（This is not popular, you won't see that as many times）
The best way to learn Chinese is TALK WITH YOUR FRIENDS WHO SPEAK CHINESE NATIVE.