Maintnence repairs, and appliance replacement questions

[Ta'Voris Murray]

Im currently in the process of looking at a duplex that is already completely leased out and has been for the past 12 years. The owner is selling because they are looking to purchase a new property quickly, so the deal that I would get on this property is a good one to say the least. With this being my first rental property (potentially if all plays out well), Im hard press to think about the what if's. The biggest one being, what if their stove or any other major appliance goes out? How could I possibly afford to replace something so large without going under? I know that it's a BIG what if, but that question has been haunting me since I figured out what a real estate investor is. Im kinda hopping into this with no money reserves and Im just curious if its even a good idea to keep pursuing this property if I dont have anything on hand for any future issues. 

I guess to get down to the soups and nuts of the post, the question is this: How do Investors handle the replacement of large appliances, and any other technician fees from a handy man being sent out by either myself or a property manager? Is there a solution that wouldn't require me to have the money necessary to fix any problem all at once?

Sorry if this is a rookie question, but im for sure a rookie.