Yay Jonathan!! It looks fantastic. Your pictures are amazing. Don't worry about what is what right now. Just write your little heart out. About anything and everything that pleases you, and let the Jonathan we all know and love come through in your blogging.
If you have any questions at all, email or U2U me. I'd be happy to help.
Regarding tags - think of tags and categories this way (I just read this analogy yesterday and it made all the sense in the world) Consider your blog a textbook - categories are like chapter titles, tags are like the words in the index. Tags should be very specific. This is where you might want to put designer's names or decades. Whereas in the categories, you may want to do very general terms: Couture, Museums, Books, etc.
Sandra