Most topics I have seen, as well as posts average under 150 words, which is the bare absolute minimum requirement for an advanced role-player.
Also, this minimum is very low, and we will generally allow it if the writer themselves has good grammar and generally good avoidance of errors.
Should you wish to up your wordcount you may read the
Tips for RPing or ask any admin what they do to lengthen up their posts, and they will generally tell you.
Also, for the spelling and whatnot, I have the same issue for typos as my hands are freakin' huge and my fingers tend to hit more than one button when it's dark and late. I use word, then read it over once to make sure.