I started out with an entree level DSLR camera from Canon. I choose Canon because there are so many cheap lenses available, second hand but also from third parties, like Tamron, Sigma and Rokinon. I just tried different lenses, but also things like a reversal ring or extension tube, m42 adapter, polarizer filters and many other things. That is how I rolled into astro photography, whereas nowadays I’m more into bird photography. My advice, just play around and experience what you like the best. Expensive gear is oftentimes not the answer.
Sure go ahead! I was always interested in the technical side which made me pursue the route with adapters and different types of lenses. I hope you find what makes you happy :)