If you purchased the property at a tax sale and a deed has been recorded, then it's your property (subject in some states to a period during which the original owner can redeem the property by paying the taxes and costs of sale). If you gave a mortgage to finance the purchase, then the terms of the note will govern whether you can lease the property (generally, home mortgages do NOT allow you to rent a property out). Finally, if that is not an issue whether you can lease it or not depends on local zoning codes, but generally the answer is yes.
It is possible to sublease the property that you have purchased from the county for back taxes as long as you have a title deed of the property. It is also possible to buy it back when you pay the taxes and the amount in which the property was sold at.