When learning a new language, should I first learn how to speak it, read it, or write it?

Thanks for your invitation

I thing you must at same time when you learn a new language you would have to try lisenting to the pronunciation and vowels and speaking the word and writing it to fixed in your mind.

Reading is the first skill you should start with.

Learning any language starts with listening . Then , comes the second skill in learning ; i.e. speaking . After that , one can learn reading and in the end comes the last skill which is writing . 

In all conventional wisdom, a child first learns to speak then write and read. That is the best trend.

The main difference between reading in a foreign language and reading in your native language is, naturally, that you began reading your native language once you were already speaking it fluently, while as a beginner in a foreign language you don’t quite have that luxury. 

The challenge is therefore finding foreign-language reading materials that are commensurate with your level of vocabulary and grammar.  If the reading is too difficult, it can create an excessive cognitive load, inhibit any real learning, and discourage you from reading further.

The best way is to approach it naturally, the way children do:they first learn their mother tongue,then learn how to write and read. This sequence applies comfortably to languages with unique alphabets like Russian,Chinese,Arabic,Hindi,Urdu and so on;especially, if your intention is to have a good grasp of the language.  

learning the alphabets first then writing, reading and speaking all together at the same time.

Merging the two together. We must note all the paragraphs.