A common writing mistake is not doing dialogue punctuation correctly. There is actually a site article about it now, so reading it is worthwhile (even if just to confirm you are doing it right, if you already are).
Dialogue Punctuation article link.
Other than that, when writing branching narratives, things tend to get out of hand rather easily, which means starting small is generally encouraged (if you lack prior experience). Otherwise, just be mindful of the scope if you do go for an epic right away (but be warned that this is generally unsuccessful).
For the site, you just want to keep in mind that only finished works should be published. If you want to share unfinished stuff you can set the storygame to sneak preview, which will allow people to access it without it being published. Good way to get feedback.
Other than that, if you annoy someone they'll likely let you know, so just learn from it and you should be fine. That is, of course, assuming you don't do something extra stupid that warrants an immediate ban, but judging by this post of yours, I am hopeful that you won't (so this last part shouldn't be too much of a concern for you).
Regardless, welcome back from the dead. Enjoy what time you've got now.
