Welcome to MR, Seiber.
Since you have already found the beautifully formatted ebooks by some of our very dedicated members here, make sure to check out the Deals, Freebies, and Resources thread. There is the Writers' Corner where some of the member authors post about their work and (at the very top of the page) the Wiki for additional information.
Jump in and ask questions if you need help.
I have the *BLUE* 505 and absolutely love it. I think the very first thing I learned was about the formats that the Sony uses (epub, lrf, Sony's DRM'd version of lrf -> lrx, pdf, and ADE) plus the fact that you can download books from the library. (I'm still learning from the members here

)
Have fun with your new 505

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