set a monthly budget, and pay all your bills on time. that will help raise your credit scores. if you get a credit card, pay the whole bill of each month. interest payments are just lost money over time. plan in your budget an "entertainment" amount, a small amount each month for doing fun things, like dinner out, or going to the movies. if the month gets tight, cut out the entertainment first.
Joining the military is a good way to start off being able to support yourself. You'll get your college paid for, have a full-time steady job, discounts, a free home, free food, and you'll be earning good job experience.
Once you have a nice job established get a Roth IRA to save for your retirement. You can save anything from $10-$100 per month depending on what you can manage. They will give you an outline of how much you should deposit each month to reach your retirement goals.
Put your money in the bank and only spend it on what you NEED, as in clothes for work, food in the fridge, rent, etc. Don't waste it on frivolous crapola that you want but don't need, like video games and stuff. Sacrifice now and you'll be able to afford whatever you want later.
Once you have a job and income, it is very important to not spend more than you make. Track how you spend your money (ex. check book register or excel spreadsheet) -- being aware of where your every penny is going will be helpful. Also, set aside a certain percent from every paycheck into your savings. If an emergency arises, and you need to dip into your savings, make sure you replenish it.
Credit. Unfortunately, people need to have good credit to get that loan, to get that house, and to move up in life. You can build credit, with things such as student loans and credit cards. Be careful though -- be sure to pay off your credit card bills in full each month. That's why it is important not to spend more than you make, and track your money.
You start out with an education. None of that is likely to happen without a good education. With that, you can then get a good job, start investing and saving money and have the means to provide you and your family with the lifestyle you are after.