What do you think I'll have to pay in taxes next year...

I’m graduating college here in a few months, and I’m sending resume’s out for jobs now. I’ve figured out that I’m going to need a minimum of 28k a year to live off of, and more to live comfortably. But I’m not sure what I’d likely have to pay in taxes, so I’m not sure how much to ask for/aim for with the jobs. Rough back-ground, white male, 23, no kids or spouse or any dependents. Not minority of any kind, no disabilities or anything like that. Any ideas?