I need help,

I have done plenty of PVC drain "adjustments" and remodels.
I have am now attempting to do a complete ruff in off my own house.
I can't seem to find the information that states how far a vent has to be from a drain or what size pipes are required for different drains.
I have a full bath with a custom tile shower, commode, and double sink on the second floor.
I also have a half bath below it with just a pedastal and commode.
I gutted this part of the house, so there is nothing existing except in the basement where the final hookup will be.

Can anyone help?
I am in Medina County, Ohio....