If you want a cheap way to do macro you could look at some of the Raynox lens adapters, they do a 150 and 250 one. When I first got into photography around 2009 I had a canon 500d or d500 I forget, with a kit lens and purchased one of these (250 one). It was great and not expensive at all. I know loads of people use them, even on top of their dedicated macro lenses. I believe one was for sale on the forum recently. I gave my old gear to the young lad next door and see him out in the garden still using it...it was a 12.1 mp camera so not hi-tech by modern standards.
http://www.raynox.co.jp/english/dcr/dcr250/indexdcr250eg.htm
Also, have a look at Affinity for software (some prefer it over the adobe options as its a single time purchase.
https://affinity.serif.com/en-gb/photo/#buy). I have both, but I do stacking in Affinity as I find it easier to do. You'll find loads of tutorials on youtube regardless of the software you ultimately decide to use.
I love macro, it is great to see small objects in new ways.