@MikePhil just to simplify things: There are two main ingredients required to accomplish recording. A DAW (Digital Audio Workstation), which is the software part. As I mentioned previously and have others, you have many choices for DAWs, ranging from free ones with limited capabilities, to more complex ones, with robust capabilities. Do your research to see which suits you. I have tried/used a couple of them, and have settled on Reaper. There’s even a thread here for Reaper.
The second ingredient is the DAI (Digital Audio Interface) which is the hardware component. I use the Zoom U-44, but there are many other choices. It has been pointed out in other comments that some come with software (DAW), but I play that down as I think you’d prefer to choose whichever DAW you’re most comfortable with.
The only thing needed after that is the required cables, and some learning on your part.
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