Those of us who have chosen to teach journalism don't really teach, we merely light the way. It is free to all. I suggest you bookmark it. I main page. American Heritage Dictionary.
Some students find it beneficial to buy a copy, though all stories can be found on the Web.
An e-mail account and access to the Internet. A pocket folder to keep all graded work, handouts and printouts. Some prefer three-ringed binders. I no longer require this reference, but some students find it useful, particularly if they are not comfortable with the Internet. Bring your books and all other relevant materials to class each day.