Can anyone follow Buddhism if the person has had drinks & ate non-veg in the past? Can anyone follow a Buddhist life-style or philosophy even If the person has been violent or ate non-veg in the past or has drank wine.

If yes then what are the beginner steps?
As long as a person gives up violence and drugs &amp; alcohol, they can be a Buddhist. 

The ideal step is to clearly see why violence &amp; drugs/alcohol are harmful and do not bring happiness.

As for vegetarianism, it is not strictly Buddhist, even though it helps nurture compassion.