The perfection of the fit in terms of pacing and content is between you and the editor/ contest judge. they'll let you know how you did by publishing or not. You can always ask for constructive feedback and who knows they may find the time. You can also get editorial and content help here before submitting it. either by posting it in this thread or sending it by pm.
As far as pen names, they are good for copyright claims (try to be original) but are not used for payment. They will require your true name/ address/ e-mail account/ paypal address/ or some such nonsense to start the big bucks flowing in your direction.Usually this is explained in the submissions guidelines.
Yours
Mad