Most newcomers of /rp/ altogether are encouraged here to post here, as it is considered the overworld of most /rp/ threads. Beyond the main serial, there are plenty of spinoff threads planned based on major events in the town. When they begin, it is assumed that the newcomer is in the cavern, when not giving a specific setting.
Just like most /rp/ threads, it is taboo to use unwarranted all-ruling OC's. Most alicorns are discouraged from roleplaying, and absolutely no immortal godlike creatures are allowed.
|“||Nestled in the center of Ponyville, just north of the bustling town square, the well-known Inn of the Last Home was open for business today, and the smell of potato fries and apple cider among harder drinks drifted out pleasantly on the wind. The interior was oak paneled and lit by the soft glow of several lamps and a softly burning hearth on the far side with several ponies of all ages and walks of life gathered here and there for the famous food or drink or just to swap tales and meet some new ponies. The tavern owner was in the back cooking, while a blue stallion with a lavender cloak and hat waited behind the bar, serving drinks with a friendly smile and reading from a book between customers to chat to.'||”|
–OP, First Paragraph
Of course, when you're doing a spinoff thread, you can make the OP whatever you want. However, it is preferred by most to copy the main thread's OP, word for word.