I would like to tell you about real life examples.
There were 40 JW kids I grew up with that I knew well. Of these most got baptised as teenagers. Of those 17 have since been disfellowshipped. So now none of their JW friends that grew up with are allowed to talk to them, and most are never spoken to by their parents. One friend I knew was baptised at 16. At 18 he feel in love with a worldly girl and had sex with her, so was disfellowshipped. He is now 38, still married to that same girl, and has children. His parents never speak to him and do not see the grandchildren.
A girl on this called crumpet was baptised at 13 and disfellowshipped at 16. She is now 26, and still shunned. She did not know that her sister was married till 2 years after the wedding, and only found out by accident that her auntie had died.
Does that sound good, normal or Christian?
I found out that this religion was not guided by God when I was in bethel, at 25. but I stayed going to meetings for 10 more years because i was scared of loosing all my family and friends, so lived for 10 years feeling like a miserable hypocrite. I got married so that I could have sex without getting disfellowshipped (which is the reason so many JWs get married very young) and so dragged my poor wife and 2 step children into the mess. Now none of us are JW's. What this means is that excommunication backfired, as now there are 4 people that are not JWs and not just one.
Excommunication is misused by the Watchtower Society, as it is by many high control religions, to manipulate it's members. If you would like to know all the reasons a JW can be disfellowshipped, and why it is not supported scripturally please read http://www.jwfacts.com/index_files/disfellowship.htm
This is probably one of the most important things you should know before starting to preach to others, and especially before choosing to get baptised.