The P25 card will allow you to copy the so-called 'mixed mode' digital stuff, but it's not capable of handling the newer P25 systems out there. And of course, it can't handle any Phase 2 systems.
I don't believe there's any special USB cable for this radio - any off the shelf one would work, I think - but beware that you must be aware of what operating system you're using on your PC. Win8 and 10 take a bit more work to find a compatible cable and drivers. Our
Connecting Scanners via USB article in our wiki has extensive information and links on this very topic.
As for software - hands down, ProScan; and the author is a RR member. To be fair, ARC250 will also do it (and Gommert is also here), but again, watch to see if it's compatible with the OS you're using on your PC (Both packages are Win 8.x compatible, but I'm not sure about Win 10.x). Of course, in both cases, you will need a RR subscription to pull data from our databases, and both packages support this.
Mike