If you have to use floppy disks, make sure you keep copies of all your software and be prepared to spend hours recovering from a disk failure. Sound is a luxury in the workplace, but nice if you can get it. You'll want a sound card to run your speakers, headphones, and microphone. It's hard to work without one. Ink jet printers are fine and color is affordable.
Laser printers are faster, higher quality, and more expensive.
If you don't have a virus checker, you're sure to have a sick computer. You'll also want an office suite like Microsoft Office or WordPerfect Office, but you can get by with a word processor and a spreadsheet. Your Internet Service Provider should give you what you need for email and web access.