What is the salary of advocate and lawyer/difference bet them?

hi.i'm waiting for my 12th results...now i'm thinking of pursuing career as a lawyer.which is worth doing B.A LLB or B.B.A LLB?And i heard that there are some 2 years courses in various disciplines after LLB is it necessary to do that,if yes which is best for me to do?can i do that 2 years course part time while doing LLB?what will i earn then?PLEASE HELP ASAP.....