I'm in Texas and have been known to cover parts of 11 counties. Congrats on passing the test. As a newbie, don't worry so much with your area, worry with which brokerage is going to give you the best training and support.
Although, if you are doing it part time, which is what you imply, you'll regret spreading yourself thin working areas an hour apart. Maybe you can clarify. Are the counties adjoining? If it's something like Beaumont/Orange, you might be able to make it work. But say, Beaumont/Baytown, heck no. You have to consider MLS coverage. You should probably pick one MLS and a brokerage that belongs, then limit yourself to the MLS coverage.
You probably should interview a couple of brokers to get a better feel for how it works and ask them what they think of your plans. Get your feet wet before you start joining multiple MLS's and shooting yourself in the foot.