Here are steps that can help you make it in the advertising field:

Be familiar with the industry – make sure that the position you’re considering is what you really want.
Understand what is expected in the chosen field – find out if you’re ready to face the challenges of an advertising career.
Your educational qualifications – is your field of study leading to the career you want or do need further education to gain expertise.
What are the possibilities – check out the working environment and weigh the possibilities that appeal to you.
Decide on what career to pursue – if you’re really keen on advertising then go for it, but, it is okay to look at other related occupations.