It depends on your goal and whether you'd write them by yourself or outsource them.
If you do them yourself then you should definitely post them one by one. If you outsource them then you should have a fixed goal number of articles to post.
The number varies on your aspiration with the website, you might have the sole goal of posting 100/200/500/1000 articles, or you might want to have 10000/25000/50000/100000 visitors a month, or $1000/2000/3000 a month. Everything fits inside pathway of your end goal.
If you do them yourself then you should definitely post them one by one. If you outsource them then you should have a fixed goal number of articles to post.
The number varies on your aspiration with the website, you might have the sole goal of posting 100/200/500/1000 articles, or you might want to have 10000/25000/50000/100000 visitors a month, or $1000/2000/3000 a month. Everything fits inside pathway of your end goal.