Your story length should be 2000-6000 words. If you sub something longer than that, it'd better be really funny or you need to be Stephen King. Our submission window is October 1-31, 2015. Please do not sub sooner because there's a 90% chance it won't get read till October anyway, and could get buried under other emails. Publication of SF3 should be in spring 2016 (note the use of 'should' here).
For info on our guidelines and payment, please go to our Guidelines and Payment page.