Some of those questions are vague enough as to write a book about them.
Please note that our QlikCommunity is all about sharing and learning, so feel free to start a discussion about an specific scenario or a specific question, and wait for prompt, well detailed answers. But let people reply to your post so all the community can benefit from this knowledge instead of asking to send an email directly to you, and mark replies as helpful or answers if they were!
Hope this makes sense and helps you to build a stronger QlikCommunity.
P.S.: This document will help you understand how QlikCommunity works: http://community.qlik.com/docs/DOC-3098