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I am 13, no Gardening Exp., Richmond, Virginia, What do I plant?

I have a small garden this year and planted pole beans, peppers,cucumbers,roma tomatoes, pumpkin and egg plant.
The cucumbers, tomatoes & pole beans are growing, the pumpkins are in bloom too, but the two eggplants (bought already grown from Lowes) didn’t make it. The peppers, that were sprouts when I planted them, didn’t make it either.
Any idea what will grow best in South West Virginia?
I was wondering what I might have done wrong with my eggplants.
Also, does anyone know if watermelon will grow well here.