first did you get the visa to UAE If so you need to have Saudi Arabia Visa also as a passing to UAE
go to any transportaion Office in Doha and give hime
1- passport copy with UAE visa
2- car license
3- ((2)) passport Photo size for you
4- sponser letter
5- 135 QR
thats all 2 dayes you will have KSA Visa
and passing to UAE