Need help in designing custom ESP32 PCB
What does your application do? Do you want to design the copper traces yourself for the antenna or a working module is good enough? Start by googling BLE antennas or go to your distributors website. You can use an external antenna or make a design for single ended RF output. See https://www.esp32.com/viewtopic.php?t=1635 for more info. Seems like a default layout is fine.
Yes, you don't need extra flash memory on the board when you're not going to use it




Ok, you already have your antenna. And no, you don't need an impedance matching circuit as they are already matched. The difference between theoretical and practical will be negligible. Remember that the passive components in the matching circuit also won't be perfectly matched with the theoretical values.