Welcome!
In regards to grammar, well, as long as we understand you I don't think it's a big deal.

This is coming from a writer and somebody who feels pain when 'there' and 'your' are misused.

We all make mistakes.
Anyway, I am a Unity3D user as well and I also use Dark GDK.NET, one of the products sold on this website. I am working on an RPG in Unity3D and an Adventure game in Dark GDK.NET.
This forum is generally for TGC products, if you're interested in them or have any questions, it's definitely worth posting them. This community likes to be helpful, there are some Unity3D and UDK users here too but there aren't sections tailored to them.
I hope you enjoy your stay.