There are few no-matter-what's when you work for yourself, but this is one of them: get a good CPA, and never skimp! If they're good, they'll save you much more than you pay them (but pay them well). Also, get used to saving all your receipts--even if you don't THINK you'll be able to write something off, toss it in a manilla envelope anyway, labeled "2007 receipts" and sort it out later. You never know what you'll learn as time passes, and you'd hate to throw something away that you could've used to save yourself money!
What you can write off? Here's what I write off (not an exhaustive list, but just some examples) : the square fooeforum.xxxe (and the appropriate utility ratio) devoted to client space, the computers & printers & software, all office supplies, related vehicle mileage, CDs, oils, sheets, all massage clothing, pamphlets, charts, CEUs, textbooks and other industry-related books, incense, candles, bolsters, pillows, (don't forget your table, your stereo, or your chair if you do chair massage!), credit card machine, website expenses (building, maintaining, domain registration, email services, Constant Contact-type services, etc). And don't forget entertainment and eating out expenses, too. (I also write off healthcare expenses, like dental work, chiropractic, massage therapy, and vitamin supplements my chiropractor prescribes.)
I skip the software. It doesn't compare to a real live expert who becomes familiar with the in's and out's of your individual situation, and it might overlook something!
Tax forms: no W-anything!
You'll probably file a 1040 (not the EZ form, though) and a Schedule C for self-employement. If you're an independent contractor, the facility you work in will furnish you a 1099 by the end of January. If you're actually your own one-person show, there's no 1099.
Good luck!! You can do it!
Hugs,
~Jyoti