I would suggest you read some good books on apologetics, learn how to answer the difficult questions you may get and familliarize yourself on how to show the authority and validity of the Bible and God himself.
That is not an easy task. I am just learning myself, but one thing I do reccomend is The Way of the Master. There is a tv show, books, audio, these guys, Kirk Cameron and Ray Comfort explain things in a way I have never heard before and it is phenomenal! Theres a website and free videos to watch.
http://www.wayofthemaster.com/watchepisodes.shtml
On this page, watch "Hell's Best Kept Secret." Its about 36 min long but its definitely worth it.
The three people you mention sound like some of the hardest people to ever witness to. But then, I am new at this too.
Perhaps an invitation to church or a youth group party would be something to try?
As far as the 3rd type person,
3- People who can't be bothered to think about religious issues to begin with, because they are more concerned with having fun and day-to-day affairs.
Perhaps you should read to them a verse in the Bible that specifically talks about them?
2 Tim 3:1-5 But mark this: There will be terrible times in the last days. People will be lovers of themselves, lovers of money, boastful, proud, abusive, disobedient to their parents, ungrateful, unholy, without love, unforgiving, slanderous, without self-control, brutal, not lovers of the good, treacherous, rash, conceited, lovers of pleasure rather than lovers of God— having a form of godliness but denying its power. Have nothing to do with them.
I wonder how hard it is to reach some of these people? Especially teens, no offense. Our culture is a selfish one, people are programmed to want more, take more, be more... "its all about ME".... its even on t-shirts. Teens seem to be a big target for Satan.
I wish you well as you go among these people. Study hard, know your Biblical truth well, pray and trust God. He will be with you.