Drain and vents

[Kg5544]

I am trying to plumb a sink a toilet in an old laundry room location. The old laundry room has a drain that goes into a pit. I know I have to dig up the floor to get a toilet pipe in to run to the pit in the floor. The pit is located behind the slop sink. There already is an existing vent in the basement. I am unsure of how to vent the sink and toilet. See the attached pictures. Any suggestions would be great.