I'm in college now. I posted on your other thread, those 5 things.
If your parents don't have the money, chances are you will get a decent financial aid package. Apply to FAFSA when it becomes available. You can also get work-study and work on campus. If you like working with people, consider Residential Assistant (RA) in your later college years. My university pays RA's for their room $6300/yr plus a $2000 cash stipend for meal plans.
Take AP classes. Not sure what you're planning to major in, but the more the better. This is something I wish I had tried harder on. I only got 3's on them. My university accepts 4's and 5's. In addition, find out how the college will distribute the credits. For example, if you get a 4 or 5 on AP biology, then you receive credit for two biology courses (8 credits!!!). Chemistry is the same way. My school charges $1500 for a 4 credit summer class (which are even cheaper than the regular year). That's $375 per credit. If you get Biology credit, then that's 3 grand saved instantly. Plus you can graduate earlier, which saves even more. I know some people that came to my school with 30+ credits - starting off school as a sophomore! Take advantage of this. There are dual enrollment classes too, like mentioned earlier.
While in highschool, get a job and start saving. Especially in the summer. Bussing tables is a good option for weekends. If you like sports, refereeing is something to get into. It's often a cash business most of the time (tax free). Work during the summers for sure. I worked in high school doing odd jobs, playing the organ for churches, and painting. There's a lot to do - you have to go out and get it.
Build your resume, study for the SAT/ACT, etc. That's all normal stuff.