Like to go solo

Q: I was admitted to practice in 2000 and have been practicing a blend of securities and life insurance law since that time (both in a firm and in-house). I would like to go solo but have little-to-no experience in areas of law, such as real estate and wills and trusts, that I anticipate would provide stable billables. What’s the best way to acquire such skills and make the transition? Should I enroll in an estate-planning certificate program at NYU? Should I try to intern at a firm that does residential real estate law? Thank you