Hi Kapil Kesharvani,
The K32L2A31VLL1A related circuit can refer to the FRDM-K32L2A4S schematic directly.
FRDM-K32L2A4S on board chip is K32L2A41VLL1A, your chip is K32L2A31VLL1A , even the package is the same, just the Flash and SRAM difference:

About the samples, you can apply it from the nxp.com:
You can find it is active now.

About the board, you can refer to the FRDM-K32L2A4S, you can use FRDM-K32L2A4S directly or change the on board chip to K32L2A31VLL1A.
About the peripheral hardware, the same as FRDM-K32L2A4S, you can refer to it directly.
1. SPI (1 no.)

2. I2C (1 no.)

3. UART(1 no.)

4. JTAG Debug

5. GPIOs, (30/40 numbers)
Check the fanout J1,J2, J3,J4 refer to your own design.
6. Clock, Reset, etc...
clock,

reset pin, 4.7K to 10K pullup, and 0.1uf capacitor to ground.
More details, check the FRDM schematic which I give you, you totally can refer to it.
Wish it helps you!
Kerry
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