The main thing you'll need is a computer with a good word processing program.  You don't really need a state-of-the-art computer with the latest super-fast processor.  My own computer is by no means the latest model, but does the job just fine.  Program-wise, I like and use Microsoft Word because it has some useful, time-saving features I like, and consequently seems to be a fairly popular program among medical transcriptionists.  I'm sure Word Perfect has similar capabilities, but I just prefer MS Word.

For this course, you'll need a standard cassette tape transcriber.  Transcribers are foot pedal operated and very durable, as I still have the original one I started with, so they last a good long time under heavy service.  By operating the pedal, you can both play and rewind the tape.  The machine is adjustable to allow for automatic back-space (the tape automatically rewinds a little when the foot pedal is released), volume can be controlled, and the tape can be sped up or slowed down.  You can get transcribers at most office supply stores.  I have purchased several used transcribers through Ebay and have saved a lot of money and had good luck with their quality.

You will need some reference materials.  A good medical dictionary is a must.  I use a Taber's most of the time, but I also have an old Dorland's I got at a garage sale.  You will need a drug reference book.  Many drug stores carry a consumer-oriented PDR (Physician's Desk Reference) which lists most of the medications you are likely to hear.  All sorts of drug reference materials are readily available from your book store.  One book I use constantly and would like to recommend is The Medical Word Book by Sheila B. Sloane, published by W.B. Saunders Company.  It contains words (no definitions) broken down by specialty, as well as lists of abbreviations and symbols, laboratory terms, combining forms, and much more.  It is both an excellent reference material and learning tool.  You will need a good standard English dictionary as well.

For the course you really don't need a printer. Of course, once in business you will.  Printers come in a wide variety of prices and should be selected based on the volume of work they will be generating and the type of paper (banner, etc.) required by your clients.