You have two different problems here. First, learning to write software. Second, building your own startup ideas. Observation of a techie turned solo founder:

You have two different problems here. First, learning to write software. Second, building your own startup ideas. Observation of a techie turned solo founder: Building and running a business is a full time job, entirely separate from writing the code. As a lawyer, you're probably better prepared for that now than the average programmer. You might well be better off finding a problem and a solution, and outsourcing or hiring talent to solve it. If you want to code for the sake of coding, go for it! But if it's just a means to another end, it's probably not your best approach.