validity length in days? + reserving seats

Hi there
just checking that the 7 day pass starts the day you activate it and ends exactly 7 days later. So if I wanted to travel from Tokyo to Kyoto to Osaka and back again to Tokyo...if I left on 3rd July and came back on the 9th July, my 7 day pass would cover this OK?

Secondly, is it possible to pick up the pass, activate it and reserve a seat Tokyo to Kyoto, all in the one transaction.....? I'm mindful that we have to activate and start using it right away. But I also want to be able to activate and then reserve a seat and then travel to Kyoto, all in the space of a few hours if possible.
Thanks!