First off: Hi, and welcome @Iniquity to RPG. You've come to the right place if you enjoy writing and I'm sure you'll find some rps that fit your interest in a category you enjoy. Each one, from Free to Advance, have their own rping requirements. Free tends to require at least one to a paragraph with fast pacing for scenes, most I've been reminded me of instant message rps which are fun but way too fast for my tastes. I tend to enjoy between Casual and Advance levels which need about a paragraph to 3-4 made of at least 3-5 sentences, their pace varies between medium to slow in my mind. However be sure to check with your GM as they set preferences that over rule the site's descriptions since they run the story.
Second thing: your coding on your sig might not work as well you're hoping. The main reason is that Mahz, our wonderful mod and site overlord is currently creating the site from scratch. This means he's likely not got BB code up for the stuff you're hoping to create with the code you put in. Another might be because I noticed it is not BBCode, or at least the BB code used on this site. If you look at the bottom of the reply box then you'll see a formatting cheatsheet which will show you the current codes that able to be used for the site in general. Sadly, fronts aren't available yet but Mahz is gradually working toward that with time.
Anyways welcome to the site and enjoy your time here. ^-^
Thank you!
Also, I had not even noticed my signature was wonky! I better fix that. Thank you for the head's up.