Writing articles is an art but for those who have a passion for writing and have a good control on the language and populate their article with authentic content, it is an easy thing. You must be aware of the quality and content of an article when you submit it in any site. Both these parameters are important for the acceptance of an article. Grammar, syntax and spellings are the most important elements of an article and if you have difficulty in that regard then you can use some application to correct them. 'Grammarly' is one such free app.
In ISC, when you submit an article then three things can happen. First is it may be rejected. Second is that editor may ask you to correct it and improve it before resubmission. Third thing is it is accepted. There is no fixed time that it takes in these actions but generally you will get an intimation in your alert menu in the dashboard in 10-15 days time. Sometimes when there are a lot of submissions in ISC, it may take more time in acceptance of your article.
So what I will suggest is go through some approved articles here and considering them as bench mark you can write articles and submit them here.
Knowledge is power.
The article once you have posted on the site it will go to new posting section. One of the concerned editors will go through the article. They can decide either to accept as it is or they may suggest some changes or they may reject. The rejection will be mainly due to copied content. You can't post even your article also which is published elsewhere. The Editors may ask you to make some changes and then you have to make those changes and resubmit again. Then they will go through decide on acceptance or any further changes. The total process may take 7 to 10days.
You can try. All the best to you.