Keep costs down
Consider working from your house/apartment to start, especially if you have clients that will never visit you. Keep your expenses down! Working out of a basement for a year (or two) will pay off more than you know. We worked out of a friend’s basement for a year, then graduated to a crappy (but cheap) office. When we finally could afford it we moved to an A grade location. Even when we got there we negotiated for 3 months to get the price down by 50%.