Load check please

Hi guys,

Im quite new to the site,and i have seen that you can check how busy the flight is......i am off to MCO on weds ,on the vs015,and i was wondering how busy the flight will be?

Ive pre booked seats in the bubble (PE),but was also wondering if 1st class was busy?

Another thing that i dont quite understand is the lettering on the load check ie the letters then numbers? could i be a total newb and ask for a quick guide to what they mean?
Thanks in advance.

J2 D2 R2 Z0 W9 S9 K9 Y9 B9 L9 M9 Q9
X9 N9 O9
VS doesn't have a first class- UC is a business class product.
Two seats in UC and at least nine in PE.There is an explanation of fare codes in the toolbox section.
If you take out paid membership you will get 20 free enquiries on Expertflyer
DL

thanks alot for your help