Congratulations! Wow that is exciting & I am sure there are many (including myself) who are jealous we didn't start investing at a younger age.
I am going to let the experienced investors answer your great questions. My expertise is property management & I could help you with how to choose the right property management company, but it appears you are planning on self-managing. I'd encourage you to be tight with your lease & learn the local laws so you are compliant.
You will definitely be a young landlord but how you handle yourself will set the stage. You are a business owner now - just act like it. Be professional in your communication & in-person presentation. As a college student landlord you may have interaction with parents & if they find you unprofessional that may raise red flags, but if you have your s**t together you can ease those concerns.
I am a big fan of college rentals. Getting connected with a campus organization to advertise your rental may be a good idea. May find a higher quality of student & you get all students from that organization in your home they will find the next tenant from within their organization when they move out. Campus ministries are a good example (Cru, Young Life, InterVarsity). Good luck - looking forward to hearing the experts with their advice!