Desiging a Board from sratch

Hi experts, I am new to board design, and have some question please guide me, I have a hardware design Idea, which needed 2 connect a sensor with an MCU, so i have 2 PCBs (both evm) 1:- How should i start to make a single PCB using both (removing few components)?

2:- Should i first create 1 PCB, test with MCU evm then make a PCB with both?

any software tools suggestions.

Note:- Basically i have only Schematic diagram, i outsourced PCB design only (sensor part )

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