Jobs pay anywhere from 6-8 an hour to 100k a year. Depends what you do. I would say typically with some experience you could make 12-14 an hour, depending on where you work. I'm not sure if you were talking about jobs in the Culinary Industry or not, but if you aren't then I suppose it would matter what you did. I'm not really qualified to tell you in that case.
Are there a lot of up an coming restaurants? Not sure what you mean. Dallas has a huge restaurant scene, and I remember reading it has the highest per capita number of restaurants in the country. There is every ethnic food, every level from 5 star to no star. There are a lot of exciting prospects opening in the next couple of years, most notably a few places in Victory Park (near American Airlines center where the Mavs and Stars play), and Dean Fearing, formerly of The Mansion on Turtle Creek, is opening his own place in the next 2 years or so as part of the Ritz/Carlten group.
Dallas is a huge sprawl, it just keeps going an going through a number of suburbs with no end. It's all the same. You'll drive for 20 minutes and pass the same stores 3 times. I could drive to 5 different Wal-Marts in less than half an hour. Other than the sameness its a great place to live...if you can stand the heat.
Hope I helped.