You might need an AC pro to say more (aka not me).
I doubt you would buy a refrigerant capture tool - it is a big machine that shops have. It prevents the refrigerant from going into the atmosphere and destroying the ozone layer. You can probably find a shop willing to recover it for you instead of buying this expensive equipment.
They make tools (leak detectors) that are sniffers that can help you find a leak and there are dye kits too.
In addition to a way to recover refrigerant, you'll need a set of gauges (two gauges, blue and red hoses), a line to connect to your refrigerant/vac pump (yellow hose), a vacuum pump, plus R134A refrigerant and PAG oil.
You can buy it all separately from a bunch of different sources, including cheap stuff from Harbor Fright, up to professional grade tools.
Here is a link so you can see some of the main equipment:
OEMTOOLS 68988 Professional A/C Kit - R134a
An AC valve core tool can come in handy (
Amazon product ASIN B07HC9FNQY).
If you dig into it, you may need to replace ac specific green (nitrile?) o-rings. The last time I worked on ac on a cruiser (former 100 series) I replaced my compressor and receiver/dryer and some other stuff. I haven't touched this on my 200. I've used it on several other brands of car too, same basic idea.
I think ac work is a job most people would leave to a professional.