You're also free to just sit back and watch, if you're genuinely curious. Some people might not like having strangers just standing in the corner as it makes the witness looks suspicious (as if waiting for the right time to start trouble) but this concern could be brushed aside if you whisper to one of the RPers asking if it's okay to watch.
Many RPers are also welcoming to newbies, so if you do happen to pick up interest, feel free to ask them some questions later. Welcome to VeCo.
Since there is no way to notify you when someone thumbs-up your post, I'll let you know here that the picture link preceding the post made me laugh. Instead of seeing the same tiring joke about (Moon Guard's) Goldshire for the 100th time on the forums, I get -that-.
Glad to hear your experience has been positive so far! Just keep in mind that Trade chat is a small minority of the (and any) server which I assume plenty of the RPers actually have disabled as well.