Here's your advice:
Be #1 rolling out of Basic, then be #1 rolling out of A School. That'll set you up to compete for a college program, which means a free education and a commission on the back end.
Whether or not you break out at #1, work as hard as you can. Try to get assigned to sea duty for your first tour. Initially, you'll have to spend some time mess cranking, then pulling "heads & beds" shifts, but if you distinguish yourself here you'll get responsibility early. This will lead to early promotion and a few awards, which you'll want as you rotate into shore duty and continue to hustle for those officer programs. Whether or not you get picked up for a formal officer program, take advantage of Navy Campus and Tuition Assistance to get some credits under your belt.
When you're in Basic, you'll be given the opportunity to participate in the Thrift Savings Plan, which is a kind of 401k. Pass up buying savings bonds and max out your investment in TSP! Your contributions won't be taxed, and compound interest will work wonders for you. By the time you're ready to retire (yes, it will happen eventually), that pittance you've socked into TSP will have turned in to some real, substantial money.
The Navy, like any other large organization, breeds two cultures: those of mediocrity and excellence. It's up to you to determine which culture you wish to join. Choose well, and you'll be set for life.
One more thing: don't get married, don't sire any children during your enlistment, and don't buy a new car. Divorce rates are astronomical among the junior enlisted ranks - there's just too much time away. Additionaly, the junior enlisted pay scales aren't geared toward parents or people with large car payments, and you'll be setting yourself up for major financial hardship if you fall into either of those common traps.
Your pal who joined the Navy to get out of his one-horse town and has since been around the world twice, had plenty of adventures, finished one master's and is working on another (on the Navy's dime), makes significant money in private industry, and still flies in the Navy Reserve because it's more fun than renting a Cessna,
FrankCobretti