please help! download and converting problem

I'm new to download and BT... 3gT
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When I see some torrent file, then when I want to download that file, should I use any downloading tools / programs?}0b@9yAy2mb&R|U
If so, what program is the best and user friendly?
T~^|+{+e When I download, will there any personal information will be boardcasted to public?
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@ j+CM ~9Fr%a After downloaded, if I'm going to download some tv program / video, is the file type is RMBV?1c,Sw5e7Rf9E
Can I open the RMBV directly? or I need to convert to MPEG/ WMV?
f%t2^o%zwM If yes, what software is the best and user friendly?
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L^HT2R&v Any other issues that I need to take care and attention?,BiL?2a2o

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zQ"yz { Thank you very much if you can help me in solving the above.....!!!!!

大部份人用 bitcomet
}5p(IcR;a 會boardcasted 例如你的ip address