If your business has employees, absolutely consult a lawyer about issues of hiring and firing employees and what kinds of records to keep. If you're not incorporated, and if you aren't careful, you can easily get in hot water with the Internal Revenue Service. The IRS scrutinizes independent contractor claims carefully. The best way to find a lawyer is by asking for referrals, especially from others in your industry. It's always better, and cheaper in the long run, to get an attorney who has experience with your type of business.
Most lawyers charge by the hour, but some have set fees for specific tasks, such as incorporation.
Don't hesitate to interview your prospective lawyer and ask about costs before engaging their services. You have the right to choose someone you're comfortable with and can afford. Then do it yourself. There are a number of excellent resources available. Nolo was started by an attorney, Jake Warner, who wanted to make legal information affordable for everyone without them having to see a lawyer.