I can only echo the comments already made! It's a very tough ask!!!
I'm only a hobby photographer really as well, but work as a designer for graphics and engineering industries and use pro photo's every day...frankly you've either got the eye for it or not when it comes to taking great photos.
Good luck with it, and as Jon said, make sure you sort out with your sister what she's expecting from you and she know's what your capable of doing. Don't let her expect pro shots if your not up to it, you'll both be happier if you understand that from the start!!!
A good camera is not a ticket to great photo's...in fact it'll give you more ways to mess it up completely if you don't know what your doing. So if your not techincally practiced with an SLR then let keep it simple. Use the preset settings, concentrate on getting good effective composition, keep an eye on your lighting and let the camera do the technical work for you.
Keep it simple and relax. Good luck dude!
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