Hey Mike, there are a lot of great forum posts about being new and just starting out. I have posted several times on this topic. There is good ideas here already on this post, and I think there are some other things you should consider if just getting started. Are you from Baltimore or investing out of state? This will make a difference in my opinion.
1) Get involved with local investor groups, go to a few meetings, meet people. You will find many people willing to share and advise. Just do your due diligence and make sure you connect with ones that are vetted and real. You will learn so much having your feet on the ground in the local market. You just have to be mindful who you connect with.
2) Consider finding an experienced investor that is willing to help or coach you, you’ll be surprised. If you find the right person, it would even be wise to pay them. Maybe you can intern with them for free. The right coach will teach you how to make money in this business which is priceless, as well as expedite the learning curve.
3) Make a detailed plan. Would you consider a resale flip or just rentals? It depends upon what you want and what type of deal comes to you first. You can with help minimize the risk on either one. Rentals are great to build passive income and flips for short term gains.
4) If rentals, what price point are you shooting for? Low end, mid priced, etc. The lower end which you describe above comes with a lot of baggage and challenges that many of us experienced investors stay away from. I doubt you would want to live in an area where the house is $15k and the amount of work it will need will surely exceed the purchase price as @alan c states. Have you driven the neighborhood?
There is so much to say to new investors, so please continue to check out the forums on this topic, especially in Baltimore if you want to do business here. Just make sure you do your due diligence before jumping in! We are all here to help you!