Will be photoing my first classic car show this weekend.

[usonian]

3. There's a lot to learn in a short time.

Make it a learning opportunity. Quick search turned up this article. Seems to cover the bases.

https://getvintagevehicles.com/vintage-car-photography-tips/

Lighting and camera angle are two big concerns. Indoor? Outdoor? Either way, you will need to position creatively and practically. Oh, reflections. A polarizing filter might be needed. Check shots for annoying reflections. You probably won't be able to modify lighting ( block reflections).

Composition varies with indoor/outdoor and you might have to be creative with focal length to get just the one car. Or be good at editing.

Depth of field. You want it or you don't. Wide lenses have lots of depth of field, so selective focus will require a fast lens.

Just some general ideas.