Conks01

Hi, I'm new to all this. My daily commute is a nightmare and I'm looking at the option of doing the CBT then travelling on a 125. The journey is 70 miles round trip so I was thinking of something like a Yamaha Virago? Is this a good learner bike? I'm confused re what license type I'm supposed to go for upon completion of the CBT. I'm 42 and the journey to work is mostly motorway which I appreciate cannot be done on L plates. Looking at the 2013 reforms if I put in for an A2 license does this mean I have to pass theory and practical modules on a larger bike. Do I also need to have a certain number of years riding experience behind me before I can do this? Any guidance appreciated. Thanks.