the pawpaw tree is difficult to raise from seed since the first two years it needs to be in mostly shade as the leaves are very prone to sunburn.
Cuttings need to be airlayered to have the best possible chance for survival and once freed from the parent tree it wouldn't be a bad idea to grow it out for a year or two in mostly shade.
In nature these are river bottom
trees that grow up under tree canopies, they grow fairly fast once established and reach for the sunlight by growing tall with few branches below the
canopy.
The seeds are designed to overwinter (stratify) and then they tend to take lots of moisture to begin the sprouting process.
Redhawk