backpack on DIY 2.4 TX

I wish to add a backpack to my 2.4 Ghz DIY TXs based on PCB labeled:
2.4GHz
ExpressLRS
EBYTE
v1.0

Please verify my understanding and I will be happy to take images of my install and assist adding documentation.
https://github.com/ExpressLRS/ExpressLRS-Hardware/blob/master/PCB/2400MHz/TX_SX1280/README.md

Parts needed ?:
1x ESP-01F ESP8285 https://www.aliexpress.com/item/2255801122884432.html
1x? antenna (not etched into PCB?, use 30mm wire or antenna included with ESP)
1x? C1 value? is this needed to keep 3.3v stable?
1x? boot button needed on IO0?

Build detail ?:
-Can initial flash of ESP-01F be performed after install?
-Orient ESP-01F so that the corner cutout of RF shield aligns with corner cutout of silkscreen.