What is your major? Different majors require different amounts of work. It also depends on how well you take to the new material.
That's a 9 hour shift (you posted it wrong too, you posted a daytime shift, 10am-7pm). On top of that, you're going to have several hours of classes. In addition, you need sleep, and time for homework. Classes here at Penn State say that they expect 2-3 hours of work outside of class for each hour spent in class.
I had 15.5 credits during my first semester, and had little spare time. Most of my homework time was spent on calculus and history. 1.5 credits of that was on an ice skating class, which meant no homework. That was definitely a help, but it still ate up time that could have been spent on other truly useful classes. (Gym-class type credits are required here.)
My second semester was 16 credits. I spent more time on homework. Calc II, Statics, and an engineering sketching/CAD class took up the most time for homework. My light class there was Economics. That class was just so damn easy for me. I got A's on all tests except the final. I didn't even spend 15 minutes studying for that, and I still got a B. I could have skipped the final and still gotten a C in the class. Still wound up with an A in that course. Class average was somewhere around a 65% on the final, though it was brought down by a 0%, a 32%, and a 44%. Otherwise, it was still in the 70% realm.
That was just Econ though. The other classes were not nearly as forgiving. Some sketching assignments took more than 8hrs to complete.
The techniques you may have used in high school too will not work in college. For me, high school was a damn breeze. The social aspect was what made it feel like utter hell, but the "academics" were, well, they seem like a joke whose punchline I was never told. Standardized testing was a godsend for me. All too many teachers would often use the standard material, and the tests used the exact same wording, so I didn't really have to learn anything. I could just remember the phrasing and match things in the mutliple choice questions. I had plenty of time for computer games and TV, with little time devoted to finishing the mindless homework assignments.
College assignments will require a lot of work. There really isn't any good way around it unless you happen to be an expert already, or if your teachers can't detect BS in assignments which are handed in. Cheating is not recommended either, as it can get you booted from a school with a permanent mark on your transcript, which other colleges will not like should you try to get into another one.
This semester, I do have a job, working on campus. It seems that work-study type jobs, at least some of them, allow time for doing homework. They don't pay a lot, but then neither does working in retail. At least that way you can get paid to do your homework. I'm taking only 14 credits, so that should definitely help.
I also advise what's probably going to be said here a lot - don't sacrifice your grades for a low paying job. Good grades can lead to government and private grants, which is essentially like getting paid to study and do well in your classes. There are also student loans available, and there should be some too which have their interest paid by the government until 6-9 months after you graduate. Yes it is good to stay out of debt, but sometimes it's unavoidable. The best thing you can do in that respect is to still spend carefully. Just because you have a loan and grants doesn't mean that you are suddenly rich. The thousands of dollars of loans will need to be paid back, and interest can start to build up quickly once the government has paid their part of it.
And finally you say that "Work/money > friends." What's your social life been like up to this point? Changing that might be tough. It seems that socializing is more addictive than pure cocaine, though not quite as dangerous. Quitting it cold turkey could drive you nuts very quickly. On the other hand, if you're used to being alone, it might not be that difficult to do. The latter is my situation. I frankly wouldn't recommend it. I seriously motivated a close friend to consider suicide when I did open up to him once about how I go about my life, and my various constant anxieties and such. So it seems that this manner of living might be somewhat caustic.
Some people do manage to find a way of balancing a job, friends, and school. I have yet to figure out how they do it, as it seems physically impossible to do it all within the time constraints given, such as hours in a day, and the fact that humans need sleep. But some people do seem to do it.