Varun,
Unfortunately there isn't a one size fits all answer for this. Your operating expenses will vary greatly based on quite a few factors. Location, property type (single vs multi, older vs newer, etc), and management will all need to be taken into consideration.
"A" class properties will generally be less expensive to operate than "B" class properties, "B" than "C" and so on..
Properties that have been well maintained or preemptively updated with modern plumbing, appliances, etc will be less expensive to operate due to less maintenance issues occurring.
Single family will generally have less operating expenses due to tenants typically being responsible for all utilities, landscaping, etc, opposed to multifamily which often times has shared water (or other utilities) and perhaps some landlord paid expenses to maintain landscaping or common areas. In my experience in the market, my single family tenants generally tend to stay longer terms than multifamily tenants.
Management will be a big expense if you're not self managing. It's safe to assume a property manager will take roughly 10% of the gross rent each month, and charge 1 month's rent to place a tenant. If you have a turnover every year management alone will have you effectively only operating off of 9-10 month's rent after they take their fees.
Like @Brandon Sturgill mentioned, it would be a good idea to run numbers at various levels to check for worst case scenario outcomes and make sure that the numbers work at different levels.