They require full sun for most of the day. At least 8 hours of direct sunlight is best. They will likely not develop flowers or fruit if they do not receive enough sun.

Yes, but it will have to be a very large pot. I suggest a minimum of 15 gallons of soil per plant. Otherwise you’ll be watering A LOT and the plants will quickly become pot-bound.

Spaghetti squash do go from green to yellow when they’re ripe, but a better way to tell is to press a fingernail into the rind. If it’s hard and your nail barely penetrates the rind, then it’s ripe and ready to pick. Even if the vines are dead, you need to wait for the fruit to be ripe before you pick it. Winter squash will not continue to ripen if they’re cut off the vine too early.