Dimorphic

First, discover a superpower. It might take a while to get used to, though - especially if it's something as weird as being your twin brother half the time.

Second, recruit a sidekick. Or, two. It'd be nice if they weren't a pyromaniacal sycophant and a foul-mouthed midget, but you get what you get.

Third, and most important, hire a mentor - preferably not a vicious mobster with a God complex, however, this may, realistically, be your only choice.

Finally: go forth and fight crime. Try not to get shot, beaten, tortured, or apprehended in the process.

Good luck!