All of those questions are answered in the Wiki
http://elinux.org/RaspberryPiBoardBeginners.
Try the FAQ also
http://www.raspberrypi.org/faqs.
You will find your answers in these locations and links to the software and howto's for setting up the SD card and what SD cards are known to be working with the R Pi.
The power supply questions are answered in there also and in the Buying guide in the wiki.
Some time spent in those may save you a few headaches.
If you are more worried about ,spelling, punctuation or grammar you have probably already missed the point so please just move on.