Guidelines specifically about a job, or just in general?
I think there's a few key factors to keep in mind with Nightwing.
1. He's not an Everyman. Despite being a real down to earth guy, Dick doesn't have the background or the trappings associated with the "normal dude." He's not Peter Parker and it goes against his character to burden him with common limitations like paying bills, getting his car registered, etc. He's superhero royalty; a super hot, hyper capable, well known rock star and one of the most trusted voices in his community, and the details and stress points of his life should not mirror that of the common man.
2. Dick Grayson is a Bat. But that's not all he is and his connections to the wider DCU, specifically the Titans and (to a lesser extent) Superman have had a deep impact and influence on him and his life. Nightwing adventures should not look like Batman adventures; Dick is just as comfortable dealing with aliens and high-concept problems as he is fighting lunatics with weird gimmicks in the streets.
I think if you follow those two guidelines, you're well positioned to create a decent Nightwing, or at least something that will feel uniquely like Dick Grayson and not a generic street level vigilante.
I don't know why sales are still as high as they are, honestly. Given the delay in publishing and everything that's happening, I sorta expect to see sales drop a lot more. By the time #75 rolls around I wouldn't be surprised to see the book selling 10K, maybe even less.
I sure as hell won't be supporting it. When Dick is back as Nightwing and has quality creators I'll come back happily, and might even buy two copies. But I won't pay for this trainwreck they're offering.