Welcome to MR (MobileRead), Louisa.
You may have already discovered the great
Kindle forum, so have you checked out all the sticky threads at the top of that forum? They are full of additional information like the "
Links Every Kindle Owner Should Have" and the "
Links To Amazon Website: User Guides, Updates, Customer Service - And More!".
MobileRead also has a great free library of mostly PD books that have been beautifully formatted and proofed by some very dedicated MR members. Check out "
E-Book Uploads - Patricia Clark Memorial Library" and look in the
Mobi/PRC section for books for your kindle.
You can explore the MobileRead
wiki and read about
DRM (Digital Rights Management),
ADE (Adobe Digital Editions),
.acsm, and
E-book formats.
Have fun exploring the forums and just ask if you have any questions.