1) Read the manual. Cover to cover, twice
2) You do not say which lens you are getting? I would start with the DA 18-135mm it is a good all around lens and will be fine until you learn more. Don't worry too much about getting lenses until you have learned the camera. Take 5,000 shots learn all you can about what you like shooting, then worry about lenses.
3) Good carry strap, good bag, micro-fibre cloth and giottos blower, Lightroom to process pictures.
4) Update the firmware, thoroughly test the camera to make sure it is all working properly so you can return within return period if something is not right. No real concerns anymore, in the early days there were some QC problems, everything seems straightened out now.
5) This forum, search old threads almost anything you can think of has been asked and answered. Brian Peterson's book "Understanding Exposure". Go buy this now and read it, twice. Trust me the time will be well spent.
Originally posted by shocktroop5811 I'm really creative with my shots and angles/perspectives. I'm not that familiar with all the numbers on the lenses and DOF/F stop techniques
Oddly, I am trying to teach my daughter in law photography and the same is true of her. She has more creativity in her left thumb than I do in my whole life. But without understanding all the numbers and technical details she will never improve and she is frustrated because she can SEE what she wants it to look like but will not take the time to learn how to do it. I on the other hand have essentially zero creativity so I muddle through by learning the technical details.
Good luck with your k-5, and welcome aboard!