Documentation or tutorial

Two things:
1) is there documentation for how to set up each of the features of the site? I’m having difficulty figuring it out, especially how to size my logo – it gets enlarged and is huge on the site.
2) I’m having difficulty uploading images. It goes through the process but never really uploads the image, it says it is 0x0 in size.

This is a lovely theme, but I’m struggling to get it to work right. Thanks.