Q: Can I start a practice while still making some money?
A: That can be a tricky equation, but if you’re creative, yes. What you’ll likely need is a part-time job (within or alternative to the law) and the discipline to work there as agreed while spending the rest of the time finding space (there or elsewhere), setting up technology (including a website), lining up your malpractice insurance, determining your practice focus and introductory fees, and beginning to develop business (based on a business plan) that’s not in conflict with your part-time role. The Bar Associations are often good resources for solo practitioners to gain information and access to other solos for advice.
You may find that you enjoy having the stable income of a job and running a practice. If so, what was originally an interim approach could become a longer-term arrangement until, if and when, you have enough business and the desire to transition out of the job. Take it a step at a time and be flexible with your goals as you proceed and progress.