some extra money? of course, you got to have the basic investment knowledge. You are your own boss if you do trading yourself. Meanwhile, you are still flexible to do whatever you like, housekeeping, homemaking,...hunting, horse riding.... the money you make from trading is considered as ordinary income just like salary.
the drawback of operating a business is that you have to file Sch C when you do your tax return if you run any business. And you are easily to get caught for audit if you don''t have any income/revenue.
with TD, you can go to school to get degree if you are yonng. The beauty of TD is you pay local tuition. That will be your another option.