please help

please help

so my mom brought this house where me and my daughter are living in. im so use to a gas heater and not an oil. and i have no idea how to read the tank. i was wondering if anybody knew: how do you know if you have oil in the tank? how do you read the tank? and does the furnce turn off by it self when there is no oil? and anything else i should know whould be very greatful. like cost a year andd ect
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