First, copy yourself to Test Center. You only get one shot with a legacy pet like this and if you mess it up there is no going back. You can use the skill gates in Britain to skill up the pet, play with the system and ensure that your build goes to plan. The training system is pretty complex.
Visit
Pet Intensity Calculator | uo-cah.com
Enter your pet stats into here and then go to the Pet Planner so you can start adding skills to see what your final build will look like. For a Legacy WW, Chiv/AI is the only build I would recommend. Especially since you are looking for high damage for bosses, no other combo on it will hit harder. You have a very solid Legacy WW. ~64% intensity. Once you have what you wnat your final build to be, practice it on Test Center. If all comes out the way you want, then you can start thinking about doing it for real.
As far as order to add skills, they say stats first magic last but you can go from 3 to 5 slots so fast it doesn't matter all that much. Make sure you fully scroll up this pet it is well worth it.
Never do all of your stats before you add magic and scroll up the pet. If you add too many points to say Mana or HP, you could wind up short on points for that last 120 scroll or to add Chiv.
However, I just learned something myself about EM events,
don't bring your legacy WW to them. Or any Draconic, )Dragons, Drakes etc...) pets for that matter.
Greetings, I had a bonded Cu that got killed in a dungeon and there was no ghost for my pet like it normally would. One new thing that occurred before this incident was that my Cu went wild during my dungeon run. I assume my pet went unbound? I'm new to taming so my question is on pet bonding...
community.stratics.com
Read this thread, there's a few poor souls here who learned the hard way what can happen at EM events.
edit: Also, and this is in the above thread, if you are going to go to EM events and high end bosses with your trained pets make sure you are running real 120 taming/lore. If you are using jewelry to raise to 120, if you forget to put on that jewelry or it gets taken off of you and you command your pet it will eventually go wild. You could technically get away with 110, but you have chances for your pet to disobey orders and eventually go wild as well. I mention this because I see your pet above is "Extremely Happy", which should only happen if he disobeyed orders or was out of sight from you for too long.