Hello ,
- I recommend you first can have a look at the demos under SDK package, it also includes IAP program "flashiap", download from:
https://mcuxpresso.nxp.com/en/select

- About hardware development , there is a demo board LPCXpresso51u68, you can refer to the schematic:
LPCXpresso51U68 board for LPC51U68 MCU | NXP
- About MCU ID, do you mean UID? If yes, please refer to this thread:
LPC51U68 Read UID
Hope it helps,
Have a great day,
TIC
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