Drupal 8.x

Hello everyone, I wanted to ask how can I import this site www.vuke.net on drupal. From afternoon to search on google how to find a guide, but zero , then I came to ask you that you know more of course. Sorry for the broken English but I'm not here

With Drupal 8 around the corner, is choosing whether to use a multi-site with a single code base, more or less appealing?

I've used Drupal 6 multisite with a single code base, as it makes keeping the core up to date, much easier. The only downside is having to put each site into maintenance mode, and run update.php for each one, made easier using the Drupal Remote Dashboard module (and corresponding Server).

PHPstorm is an Integrated development environment (IDE) that seems to be used by many developers, but it costs rather a lot for those of use who code occasionally.

Is there a free alternative to PHPstorm that can be recommended?

On my site I want to have a couple different packages that someone can purchase. When the package is purchased I want the user to than go through a registration process where they will fill out a name organization, admin name, etc... This will then create either a subdomain or a subdirectory, full drupal install with a copy of a pre exisiting db and activate their theme.

I guess the question I'm asking does anyone know how to execute bash on a purchase or a drush command on purchase? Or is there a module that does something similar. Thanks!

This is begining to make me pull my hair out.
I've gone threw afew different tutorials setting up a menu link in drupal 8 using the new routing method but everytime I end up with the same issue. When I clear my site cache I get this Exception:
InvalidArgumentException: Class "\Drupal\hello\Controller\HelloController" does not exist. in Drupal\Core\DependencyInjection\ClassResolver->getInstanceFromDefinition() (line 29 of /Users/john/Documents/websites/drupal8/core/lib/Drupal/Core/DependencyInjection/ClassResolver.php).

I would like to make an e-book library in Drupal. I have plenty of e-books and I would like to have an easy way to store and find my ebooks so that my children, siblings and so on can access them easily and in an "library-fashion".

I think I know how to set it up using taxonomy, content types, views and so on. That is the easy part.

The difficult part is that I would like it to retrieve the information about the books automaticly. From Google Books, Open Library, or similar.