I have to write something

I have to write something, because I have been a little bit lazy lately and I have been without writing a word long time (rather than "I have been without writing a word long time", you could say "it's been a long time since I wrote anything" or "I have not written a word in a long time").

Writing is always a heavy and hard task even in your own language.
If you want to write well you need to organize all the ideas properly, using linking words to make the reading understandable, being carefull with the spelling, etc. Besides if you are writing in another language, it is very useful to know grammar rules and the way of saying things, because this can change in other languages. (Yes very true - good job!)