please help! download and converting problem

I'm new to download and BT...
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z)B&`OI6Vo When I see some torrent file, then when I want to download that file, should I use any downloading tools / programs?
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If so, what program is the best and user friendly?
;_[W6S#]sr When I download, will there any personal information will be boardcasted to public?u0f6wCd
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After downloaded, if I'm going to download some tv program / video, is the file type is RMBV?

`+MX:zP3Y~ Can I open the RMBV directly? or I need to convert to MPEG/ WMV?6v3Len%{k!|%h*o
If yes, what software is the best and user friendly?)YE;j|k)|1~"lx

XA0d K0D6X$ab)m Any other issues that I need to take care and attention?
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Thank you very much if you can help me in solving the above.....!!!!!

大部份人用 bitcomet
Gv&n1m!d-s[)_$z 會boardcasted 例如你的ip address