When I started ghost hunting, I had no idea what equipment I needed. I started with the essential tools that did not break my bank, as I had limited funds then. I recommend you do the same before buying expensive tools. You can read more about the essential tools and things you need here.
When you know you love your new hobby and want to dig deeper into the paranormal, it is time to step up the game. Most types of equipment are not that costly if you go with the standard ones.
Below are my recommendations if you want to elaborate with more techy things than a flashlight, pen, and paper.
The links below are affiliate links to Amazon. Not all equipment is exactly the same as mine, as some are discontinued and replaced with upgraded versions.
I use this equipment and tools in my spiritual practice and paranormal investigations. Happy ghost hunting!