Welcome Matt & Krista! Before you invest a dime, make sure you have adequate reserves set aside. Because you are a one income family, if anything were to happen to your wife's job, you would want to make sure you had at least 6-9 months of reserves set aside so you could make it through until another job was found. You also need a certain amount set aside for each property you purchase.
After you have adequate reserves, then you can start looking for property. You say that you want to focus on college students, so I would imagine that narrows your focus of area down significantly - a good thing if you are travellers. You didn't say, however, if you were wanting to buy single family homes or multi units.
If you choose the latter, the good news is it is much less competitive, so a good realtor could be looking out for what you want in your targeted area, and on those occasions when you're back in town, you can go look at what's available. Or, must the two of you always travel together? Or, how comfortable are you buying sight unseen?
This last strategy requires having someone on the ground that can send you excellent photos of the property and the surrounding neighbors. Of course, you will still hire a property inspector to make sure what you are buying is sound (because you are travelling, I wouldn't even consider buying a fixer, since as Aaron points out, managing contractors from afar is a huge challenge). You would also need a title company willing to do virtual transactions. With Hello Sign and such, these are becoming much more common (ask your realtor to find you one).
If you think having tenants is a challenge, having tenants that are also students is even more so. It is imperative that you have a property manager skilled in this niche before buying your first property. It is also imperative that anything you buy cash flows with a property manager's fees included. Buying a multi family should allow you to do that (I'd start with a 2-4 unit for your first one, which will allow you to use conventional financing).
So, before you start, get your reserves, identify your target area, develop your criteria list, interview and find a realtor and property manager, and then decide if you feel comfortable investing sight unseen or not, and go from there. I hope this has helped and good luck!