My lifting life lessen is to lift heavy and often. Full range of motion. Use foundation lifts...squats, heavy rows, incline bench, weighted dips and chins. Do an arm blast once a week. If you have done your foundation work properly you have already hit arms.
Health advise is get blood workup twice a year minimum and pay attention to results. Stay out of the sun if you are light skinned. Do not smoke and drink alcohol modestly if at all. Have fun and play sports. Walk all you can.
Diet advise is eat natural foods...lots of protein and save your spare money to invest in your 401K if you have one...not supplements. Fact is that gear is cheaper than than the hyped supplements. If you do not plan to compete stay away from gear. Whats the point? Stay hydrated.
Hard to believe but married men live longer.
Financial. Look for foreclosed property that you can fix up and sell or rent. Someone else's bad fortune is your good fortune. Borrow from family if you must to get started. When I was young I blew the chance at picking up the house next door for about 100K. 20 years later today its one million.
Our society is splitting in half...haves and have-nots. Be a have no matter what it takes. Always be honest in your dealings.
Think with your head (the one on top of your shoulders) not your heart. That's tough when you are young.