1a) You need to add a featured image to each of your posts.
1b) ID is case sensitive, please change your section id from
2) Regretfully, this is not possible, assigning a page as a blog page will prevents it from being editable. The theme will populate it with your blog posts.
2b) Wordpress automatically creates an archive page for your posts categories eg. http://yoursite.com/category/finance
2c) I checked and the titles are already capitalized.
Hope that helps