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Carry some kind of liability insurance.
Get a phone line specifically for this business and put an answering machine on it. I know this increases you initial investment costs, but you don't want customers calling you on your home line.
How do you plan to receive payment? At time of service? By cash or check? You will probably need to get set up to handle credit cards.
When you fix a problem, write up a charge ticket/receipt describing the problem you fixed. Keep a log of this information on your laptop (you really should carry one with you). You need a record of problems you've found and fixed for each customer. This info is invaluable when the customer stuffs up his system again and calls to complain and blame you for it.
You will often need to connect to the internet while at a customer's site (to download drivers, etc.). If the customer doesn't have a connection, or his firewall restricts your access, a wifi card in your laptop could save the day. Unless you're out in the boonies, it shouldn't be hard to find an open network. (There are several in my small office building alone.) If you have to, drive to a Starbucks and park outside.
Best of luck.
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Out the 10Base-T, through the router, down the T1, over the leased line, off the bridge, past the firewall...nothing but Net.
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