Good "flying solo" article from Lawcrossing.com
Lawcrossing.com has a pretty good 'flying solo' piece here. I think most of the advice from the piece is pretty right on from my experience.
If you are in the pre-client (or few client) stage upon start-up, I think you need to go home office or space-for-services set-up with other lawyers. I had some five clients when I started our practice in April 2005 in a space-for-services deal. I was immediately profitable...my expenses weren't too much. The thunderbolt that I had to deal with was when the lawyer who owned the office condo I was in got up and left for a law firm job and put the floor on the market. Having to pay rent probably increased my expenses by some 300% immediately.