Welcome to the community! If you are a responsible spender, the first thing I would do is open a credit card and get that line as high as possible. Then put all of your normal purchases on there without exceeding roughly 30% of your line limit. Set up autopayments from your checking account to your credit card for the statement balance amount so you never pay interest. That will help you to start building credit. You will also earn credit card rewards in the meanwhile. Nerdwallet has great info on the top reward credit cards.
Continue living with your parents until you have roughly 7-10% of the purchase price of a duplex you can afford in your area. That will fund your 3.5% FHA down payment, 1.5-2% in closing costs (unless you can negotiate those from seller) and some reserves for repairs. Then purchase a duplex. Live in one side and rent out additional rooms. Then rent out the other side either by room or as a unit. This should keep your living expenses very minimal so you can continue to keep saving. When you reach 80% loan to value (LTV), refinance into a conventional loan to remove PMI and make you FHA eligible again. Then repeat the process but next time with a fourplex. Then you can continue to stack fourplexes to take advantage of low down payment program or you can start scaling up to small apartment buildings and so on. If I could go back in time before I had kids, I would absolutely do this. You are so fortunate to be starting at a young age!
If you need a great agent in the Boise area let me know! I know a great one out there.
