I wish you all the best in your new job,
I will miss all the good times we spent together, opening the boxes like a Christmas gifts,

laughing with liars dogs like Billy and his friends, whe flying dogs hair and I look with a big moustache in my face....etc

I am not sure what you mean here.  I expect you are making a reference to something you and your friend understand, but I am not sure what it is.  "Liars dogs" makes no sense in English.  Dogs belonging to liars?  That would be liars' dogs.  Even then I'm not sure what you mean.

"Whe flying dogs hair"  When? again hair of the dog would be dogs' hair (or dog's hair if just one dog).

Always capitalize the word I.  Do you mean to say "the way I look with a big mustache in my face?"

I hope you see you soon
Good luck.

I hope that helps some.  I'll try to remember to check back here and maybe we can figure out the best words for what you're thinking.