I have a pair of RAW Steel 32GB SDHC cards in mine -- have yet to EVER fill the first one! It will hold hundreds of photos unless you're shooting RAW and no you don't need to shoot pro grade RAW shots.
Go back to Ken Rockwell -- find your camera -- read his stuff - mess with your camera... He's got all manor of info on there.
Just don't think you're going to remember ANY of it for a long time... you've just got to read - play - read - play - get an understanding for what you WANT from a shot you see with your naked eye... composure etc....
In the meantime -- most of my shots are taken in Auto mode and I spend more time actually looking thru the lens and trying to make the shot interesting. Really look thru the camera and note the background -- where things are - where the subject is within that frame... would it be more interesting off to the side - or toward the bottom -- or maybe a different zoom - or different angle....
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