Yes, the book of Proverbs has excellent advice for everyone, Christian or no. There is a lot of wisdom there.
Be open to advice and get it from a variety of sources. If it is wrong, you can consider it, figure out why you could argue it is inaccurate and feel more convinced of your correct decision. If it is right, it will save you years of pain and trouble, you will prosper and you will be even more convinced of why this was the right way to take. It does not hurt to have an informal committee of "sober second thought", as our senate is supposed to be by definition. These are people who have a reason to want your life to well and who have invested in your in some way. These people may have experience in different areas and can be someone to run any major decisions past to see if there is anything you may have missed in your considerations. Any good decision can withstand scrutiny!
Your pride is of very little use to you and will hold you back in nearly every area of life. Learn to admit your mistakes and say when you are sorry. People will respect you for your humility and courage!
Establish a circle of friends who have different kinds of knowledge, skills, perspectives or qualities that you can access, whether it is how to fix a car, where to find the best deals, legal or business advice, medical help or whatever else. These may include a variety of age groups, backgrounds and personality types. Think also what kind of collateral you yourself bring to the aquaintanceship or friendship.
Don't get in bed with anyone that you couldn't see having a child with. It's a natural outcome of that activity and with even the best laid plans of mice and men - well, accidents do happen.
Get involved with people from all generations in some way. Whether you are single or married, you can bless the life of someone in the next generation and get a lot out of it yourself in return. Look for friends your own age, but also cultivate friendships with people from your parents' and even grandparents' generation. They have perspectives that you will not encounter by only sticking to people your own age. Your extended family is a goldmine. Seldom will you see the lives of friends or acquaintances close up in the way you can with your family. I have learned a lot of both what to do and how to avoid badness through observation how those decisions worked for the people in my extended family. This also covers the intergenerational involvement.
Learn all you can, wherever you can, from whomever you can. You don't know when you will need that information, even if it totally unrelated to what you are doing right now. Learning to play guitar one year while I was subbing, or getting a scholarship for a two week course in something I wasn't trained for or thought I'd need ended up getting me two of the jobs I have been happiest in. One man we know who later became a missionary never expected that he would need to learn to pull teeth and do dental work in the mountains of Peru! Also, even negative examples of leadership or bad experiences can teach you just as much as good things. Don't miss the lesson!
Resign yourself to the fact that there will always be one person at least in your life that will put sand in the gears for you. They will bother and annoy and be unfair to you. Learn now how to handle it, instead of railing against it or wishing that part of your life away. If you don't fight it, they will rub off your rough edges and actually bless your life!
Have a thankful heart. My mother used to say, "A person who isn't thankful has too much of something". I think she was very right and I have found that the more sincere gratitude you develop, the happier you are and more good things come your way. Let people know when you are thankful to them. In all situations there is something that you can find to be grateful for.