If you're humble enough to take the latter approach, that's the best one, imo. It allows you to get a feel for the game on your own terms and with much less frustration. Dive into Dustloop forums once you've established that you want to meet a higher standard.
In terms of the basic mechanics, the game's tutorial has got you covered. Norviltataki's 'Airdash Academy' series is also a great place to start if you're relatively fresh to anime fighters, as is his 'Guilty Bits' series, which are character specific outlines based on AC+R, but a lot of the general strategies of the characters translate well to Xrd.
Airdash Academy:
https://www.youtube.com/watch?v=HWfk3tOJjaQ
Who are you most interested in playing? Being a Dudley player, I'd suggest you give Sol a shot:
https://www.youtube.com/watch?v=yXxyzS1o_XQ
Tutorials and learning materials are kinda sporadic, so I might be able to help you find a more direct resource if you have a specific character you're interested in.