It really depends on what's practical for you. Your question is pretty broad and I can't tell you what you need. I don't want to be a dick about it but most of these questions could have been answered with a simple search..
I took time out and set you up with some reading material to help answer some of your questions....
http://www.tgc-forums.com/phpBB2/viewtopic.php?t=869
http://www.tgc-forums.com/phpBB2/viewtopic.php?t=592
http://www.tgc-forums.com/phpBB2/viewtopic.php?t=112
http://www.tgc-forums.com/phpBB2/viewtopic.php?t=624
http://www.tgc-forums.com/phpBB2/viewtopic.php?t=112
That should get ya started :thumbsup:
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