Need help with a couple of things

This is my site: https://pugsheaven.com/

I’m not too good at coding, so I need a “little” help:

– How do I center the title for posts?
– I need to move the header a little down and to the right. Is it also possible to put in page links/tabs next to the header? Not underneath or above, but next to it. I want the header to take up as little space as possible.
– I need to make the whole site more narrow and bring the entry part and sidebar closer together.
– In the sidebar I have a random post plugin running – is it possible to not show the gif’s when the plugin is loading but rather just show thumbnails/pictures so that people have to click on the pic to see the gif? Or is that something I have to fix with the plugin?

Thanks!