I am BGG's official honey trap
My question is this, I would like to promote some of our articles on here.
That should be fine.
Articles should include the complete text; 'teaser' articles are not welcome. (a link at the bottom to your website is fine and some similar contributors withhold the images and only share a small proportion of the total number of articles that are available on their mothersite.)
The board games related articles I suppose I can just put in the gaming article section. But we also do regular articles/tournament reports on LCG/TCGs like Netrunner and Conquest. Whereabout can I post these?
1. Articles about a particular game should be posted in that games record's forum. If you're doing tournament posts, again ideally in that games record (In session reports, would be my suggestion). Posts in general gaming tend to disappear from the front page within a couple of hours and are difficult to find in the future.
2. This said another option is to host a blog here on BGG. (Top bar menu->My geek->Blogs->create blog. Likewise some users create a geeklist of their contributions for more exposure and so other users can easily stay uptodate (example: Ender's Reviews: Comprehensive Pictorial Overviews).
Do I need to make a different account for it?
I don't see why you'd need to create a new account - really it's up to you. If you get enough geekgold, which should come through sharing contributions you could get a geekbadge to identify that you are from ATGN (mine says 'commonwealth').