Jumping in here as I've just had a similar experience and have gotten into 3D printing. It is amazing. You need a part? Print it! There are a lot of files out there, and once you get your hands dirty, you can modify existing and even create your own. I didn't know what to do about the cat heads. Found a lion face and scaled it, pow, two cat heads in 1:96. And aside from modeling, it's just generally useful. I needed a part for a utility stand. I had something that would be useful but it didn't attach. I whipped up a "mate part" and presto, in business.
For detail, definitely resin. I've tested a lot of 3D software. I bought a small CAD package, but now use Blender. It's free and very powerful. It takes a bit of learning, but much of that is just learning 3D concepts/workflow and it would be the same for any 3D software. Blender is easy to work with once you start. You can do CAD and photo realistic 3D (since 2016 IKEA catalogs have been 70% photo realistic 3D!), and even animation/film fx. You get everything and all for free (open source so it will stay free.)
Let us know how you're going and what the computer situation is. Once you print you'll be hooked, and once you make a part and print it there's no going back.