Start with this for the asnwers to your specific questions:
It might be a good idea to take a step back and work your way through the basic learning materials first.
i am sooo sry, i realize how dumn that was
i havent used adobe for 2 months and forgot about sequence setting, i usually just leave them alone
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With large still images, one consideration is the processing overhead with many of them. While PrPro CS 5 & 5.5 can Scale your images to match the Sequence, if you have a lot of extra pixels, the computer will still have to handle them. If you begin running low on resources, while working, you might think of batch Scaling the stills in Photoshop. This ARTICLE goes into more detail. Note: it was written before CS 5, and the better Scaling algorithms in the later versions, so ignore discussions on quality. We are only talking about the processing overhead here.