As a certified old man, I've already been living away from home for like 8 years lol. When I was in college, I lived in the dorms so thats different from when I got an apartment by myself after college and was already working. The main thing you'll want to do is keep on top of the little things they really add up. Do your laundry every week, do your grocery shopping every week, don't forget to go to the gym or exercise a few times a week, clean your bathroom sink shower and toilet, keep food in your kitchen eat at your dining table, wash your dishes as soon as you're done eating. Throw away things that rot if you didn't eat them. Try to find an apartment that isn't loud street noise and neighbors. If you have roommates it helps if you actually like them and that they are quiet when you want to sleep so look for quiet friends that won't destroy your house. You can bring women home to your house so make it look like a place a girl could come back to and be like wow this guy has his shit together. Put a small trashcan in your bathroom for woman visitors. Clean your sheets every couple weeks. Open your windows sometimes. Don't let your room freeze in the winter. Call your parents sometimes they want to know about your life. Remember to go outside sometimes, you need vitamin D. Try to keep a schedule and don't sleep unreasonably late for no reason. That's a pretty good list of things to keep in mind when living alone. Don't do too much drugs and alcohol also, some is fine but keep it so that it doesn't ruin your life.