Your journal can be used to inform people who come by your page as to what's going on in your life, personal, work, art or otherwise. You may want to use your first journal to introduce yourself to deviantART.
FAQ #100: How do I add, edit or delete journal entries?
Yes, there are. You may not post more than 64 avatars in your journal (FAQ #197: How many avatars am I allowed to post in one comment or journal?)
Yes, for subscribed users (deviants with a * or = in front of their username).
Deviations: Use thumb code (FAQ #80: Can I add thumbnails to my journal?)
Pictures not on deviantART: See strong>FAQ #88: How do I add images to my Journal?