This is in no way to be construed as tax advice, just common sense.
Until you do enlist a professional tax adviser, keep a detailed account of your miles driven, cel-phone bills, meals with clients or prospects that you pay for, and generally any other expenses that might be work-related. Also, if you are planning on taking a home-office deduction, the size of the home and the size of the dedicated office space along with the utilities for the home will be needed. I'm not saying this is all deductible, that's for your tax-pro to determine. But he/she needs the info once the determination is made. It does you no good to find out at the end of the year that (blank) is deductible and you haven't kept track of (blank). It also might be a good idea to use the same accountant your parents use. That can come in handy when making comparisons as far as dependency and tuition and student loan deductions.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".