Date of founding . Whether it is published monthly, quarterly, annually, etc. Precisely where to direct submissions. Often the particular editor's name is supplied. It is definitely best to direct your submissions to the correct editor.
Some publications take more than six months to respond.
It helps to know. For example, all rights, first North American English language rights, or Serial reprint rights. Deadlines and requirements for theme issues would be supplied. Some publications accept unsolicited submissions only during specific time frames such as the school year. Cover letter requirements.