DH and I have just started TTC... DS1 arrived with virtually no effort at all on our parts when I was 37 years old (wonderful boy that he is)... it all seemed so easy - but two MMCs, a world of exhaustion and a 40th birthday later and we've decided we'd better get down to business in a bit more, well, disciplined fashion. 
GCSE biology has left me with the vaguest idea that with a 28 day cycle one should do the dirty around 14 days after AF puts in an appearance, but what else do we need to know?