First purchase of a rental property, looking for feedback!

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I have been looking to purchase a rental property for quite some time now and might have found one that is reasonable, after all the numbers are crunched the property I found, which is a triplex, in a reasonable neighbourhood and in good condition would cash flow between 200-400 per month, while I thought this was low I also came up with a 17% return on the property if I were to hold it for 5-7 years, what other figures should I be looking at in purchasing my first rental property? Any advice is greatly appreciated !