The actual costs vary from state to state , even from city to city.
Local custom generally rules, but in real estate some things are negotiable.
I would suggest contacting a Realtor and ask them to provide you wth an Estimate of Seller's Net Proceeds. That will outline who normally pays what costs.
You should also ask the Realtor what they think you home is worth. In general homes sold without professional representation sell for about 16% LESS than if sold by a Realtor. Alsol, you should know that about 85% of the time sellers will eventually list with a Realtor, so as we are in the middle of spring selling season, if you are unable to sell on your own, then you'll have a back up plan just in case.