I think you will have a hard time finding a better place than here. There may be one somewhere that is focused on growing fruit trees in pots but I am not aware of it existing. In most cases people plant fruit trees in the ground, only a small percentage of people use pots. Most of the discussion about planting fruit trees in pots centers on apples. I think that is due to apples having many dwarfing rootstocks for a long time, apples are fairly easy to grow, and many people plant apples trees.
Cherries are going to be much harder to grow in Pennsylvania. This is especially true for sweet cherries. You will need to spray to control brown rot. The trees will need to be covered with nets or bird scare tape to prevent birds from eating your crop. For sweet cherries you need to pick cultivars like WhiteGold and BIackGold that work in the East. I would read through these two sweet cherry threads to get an idea of what is required to grow sweet cherries in the East.
If you’re growing in pots I would try to stay with Gisela 3 and Gisela 5 rootstocks which are both dwarfing and precocious. I think you can succeed growing cherries in pots but their going to require more work and know-how than gooseberries.