If your going for a cheap intro and have access to a few basic tools I would suggest a DYI star tracker mount for the camera.
as fancy as this if you have the finances and access to a 3D printer -
https://www.hackster.io/news/the-nic...n-0d3632d7347b
or the barn door tracker - two planks of wood and a long screw for under $40...
https://www.diyphotography.net/how-t...rophotography/