Query about booking ref & seating

I'm sorry that I'm posting this here and not in the correct forum, but I'm a poor Alevel student who can't afford a membership just yet! Anyway...
After bugging my dad for about six weeks, he's finally called up the travel agent to get me our Virgin Atlantic booking reference so that I can log in to the 'Manage Your Flight' section on the VS website. However, it won't work
So I was wondering if I had something wrong?
Booking ref: M96H59
Is this how a booking ref should look? I've always used my eticket number to login so I'm not sure.
My second issue is...we're flying to SFO but the inbound flight is from LAX...however, the seats we've been booked are 59 ABCD. I thought there wasn't a B, I thought it was ACDE etc. Could anyone enlighten me on this?
Sorry if these seem like extremely silly questions, but I'm genuinely confused and would like this resolved.
Thanks in advance!
After bugging my dad for about six weeks, he's finally called up the travel agent to get me our Virgin Atlantic booking reference so that I can log in to the 'Manage Your Flight' section on the VS website. However, it won't work

Booking ref: M96H59
Is this how a booking ref should look? I've always used my eticket number to login so I'm not sure.
My second issue is...we're flying to SFO but the inbound flight is from LAX...however, the seats we've been booked are 59 ABCD. I thought there wasn't a B, I thought it was ACDE etc. Could anyone enlighten me on this?
Sorry if these seem like extremely silly questions, but I'm genuinely confused and would like this resolved.
Thanks in advance!