Salam Brother Shaheer.
Allhamdullilah its great that you want to do dawah, i can relate to how you feel. I always used to practice islam but never talk about it too, i started asking myself why dont i tell ppl about Islam as its the only way to save them from the hellfire. The prophet mentioned in his last Khutbaa that we should pass on the message. I realized a lot of it had too do with me living 2 lives. In front of my muslim friends i was the 'shareef' boy and infront of my non muslim or non practicing friends i was the cool dude. I guess i didnt want to lose that cool dude image.
I tried to strengthen my iman by reading books about the prophet/Sahabis and slowly started telling ppl about islam... It requires sooooooooooo
much patience though. Many times i feel like banging my head on the wall thinking why these ppl DONT GET IT....
I think its every Muslims duty to pass on the message. First of all we need to differentiate ourselves from them. They dont see us praying, reading Quran etc. We need to be kind to them, be honest.. Small things make such a big difference.
I am assuming you know about cricket, wanted to tell a small story of our team. We have a Hindu on our team and remaining are Muslims. ONly 3-4 praying. One guy is really honest. You probably know when the batting team umpires that they dont give LBW and lie, this guy always used to be honest and ppl stopped sending him as an umpire

. Even i got so upset at him as others dont give LBW's why should we??? this guy mentioned that as a Muslim we shouldnt lie and god is always watching us. The hindu got really impressed with this and has started getting interested in Islam...
I personally bring up the topic of death, last day with my colleagues/ friends a lot. Nowadays 2012 ( or is it 2010?) is a good topic to bring up as its a theory that the world will end. I start by that and ask them what will happen after that and slowly bring Islamic points etc to them.... . Then send them some material/ then discuss. We got 5-6 ppl to enroll for the Islam 101 class here... . Inshallah they will be guided...
May allah strengthen your iman and you can guide others...
Salam