You should hire either an attorney, a CPA, or a reputable enrolled agent and you should do that as soon as possible to give them at least some time to look over the audit paperwork and your tax records before the audit. It may be easiest to start by contacting your tax preparer for the year in questions and proceed depending on the feedback you get from them.
The best thing for you to do is to hire an expreienced CPA in Adams, Oregon to represent you in the audit. The first thing you should do is call the revenue agent and tell him or her that you need a one month postponement to get the CPA ready for the meeting.
I agree with my esteemed colleagues. I would hire the best CPA that you could find and then get a referral from the CPA about a good tax attorney.
The information provided in this answer does not create an attorney-client relationship and is not considered to be legal advice.