I think if you really want to get into the Xenoblade series, it'd be best to dust off your Wii U for it, since you can get XC for cheaper on VC and of course XCX is on there too. I recommend you get and play XC first, which is more story-driven than XCX and easier to swallow. If you don't want to use the Wii/Nunchuck the Classic Controller is your best bet, and what I used to play it.
If you prefer less emphasis on story and more on gameplay and customising your weapons/moveset/gear etc. Then XCX is for you. A word of warning though is that it's definitely harder to get into, as a lot of things are either not explained too well or not explained at all, though you can experiment for yourself and learn from that. XCX is also a lot more open than XC, and is quite a technical marvel for the Wii U!
If you're just looking forward to XC2 and want to get into the series, then it's a bit harder to say because we don't know much about it. However, if the name is any indication then it'll likely be more akin to XC, which is what i'd recommend to play first.
Just to note for all these titles, they usually take quite a long time to finish, especially if you get into the side stuff. For example, it took me 94 and ~100 hours to play XC and XCX respectively, so prepare to put a lot of time aside for them!
Also feel free to ask any questions and i'll answer them to the best of my ability!
NNID: b00moscone
Switch ID: SW-5475-6755-1986
3DS friend-Code: 4613-6380-5406
PSN: b00mosconi
