Could you please provide us your sire url so we can provide you appropriate solution. It seems all the issue are regarding to jetpack plugin. so it will be better if you consult to jetpack plugin suppport forum. They may help you on better way.
You need to use jetpack sidebar with id = sidebar-1, there you can place slider.[shortcode provided by your slider plugin]. And regarding to site title and tagline , jetpack has its own design . So if you need to change those design than you need to consult to jetpack plugin. or you need to do customization by yourself.
Please concern to the plugin author regarding this issue, because it is not the problem with theme, so if you concern to the JetPack support, then you can get the solution asap. We hope you understand.