Hey, it's me again...

Buckle in, this is a long one.

I'm planning to build a B-25 Mitchell RC plane, and I have my uncle's professional help. He suggested that I do some research first, find plans for the plane, and create a 3D model using OnShape. However, it has been two months, and I haven't started because I feel lost about where to begin. I've tried watching a YouTube video on building an RC plane with OnShape, but the free plans I found do not align with the video's instructions. I'm reaching out for help on how to get started, where to find useful resources, or even a YouTube video that could guide me better. If you're able to share an OnShape file in the comments, that would be greatly appreciated as well. I truly need assistance!