Well, to write an article you need to understand two things:
1- Objective: What are you trying to communicate? Is it to educate/propagate/or refute? If it's the first, educate, then it is academic and you need to first define cloning, introduce its history (first time suggested, first time theorized, failed attempts, etc.), then delve into its suspected benefits and disadvantages scientifically and ethically and get on with it. If it's propagation of an opinion, then beware that you'll have people who will want to refute, so keep most information relevent and backed with evidence if possible.
2- Audience: students, public, friendly, hostile, etc. There's no way a fiqh matter for example written for muslim students of fiqh can be the same way as arguing for shariah in front of secular politicians. Equally an article explaining cloning ethically to neutral students who are probable to share your opinion, will not be the same if they are opposing and you're trying to convince and lay down a case with supporting evidence and thoughts.
In general, people's attention is short these days, and while 200 lines will deliver more information, keeping it to less than half would actually attract more eyes and circulation.
Good luck.
My personal opinion on the matter by the way is that I see no problem with it, except if it is with humans, where it can have grievous results on basis of kinship, lineage, marriage, rights, and not to mention the suggestion of one being a clone will drive psychological disturbances towards identity and self-worth. Additionally cloning requires genetic manipulation and will lead to basically engineering humans at will, which is a direct intervention into God's creation of each human's characteristics. This may lead even to worse things such as race exclusion, breeding traits into or out of a favourable or hostile population, etc.