New investor Question

[Thebam Thebam]

I am looking at 2BR 1 bath unit right now and had a question - this is investment property for me and wondering when i don't have tenant in this property, how much should i account for utilities and other things (i plan to have the tenant pay for utilities in addition to rent) so just want to have idea when unit is vacant, how much in addition to mortgage i have to account for. thx.