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Get in touch with your hosting company asap. Tell them you’ve been hack and that you want your website restored back a few days.

When you’re back up and running, change your password and make sure WordPress is up-to-date as this could have caused the problem in the first place.

Your hosting company will want to look into where the hacker came from etc and should [if they’re a good company], be able to help you increase your security.

You’ve been given some really great advise so far. If I was you, I’d think about how the sit would look and get some screenshots of companies you admire, so you have a benchmark to work to. Then I’d make a list of what needs doing to the theme to get it to where you want. Next it’s worth blocking a day or two to get some/most of your list ticked and you’re good to go! Ask us if you have an questions!

I’d do the following:

1, look at the sitemap and look for errors, if there are some then you can plan how you’ll sort them – otherwise you’re fighting in the dark!

2, Run something like Screaming Frog [free] to see what’s redirecting etc., if duplicates are being created [which hurts rankings] and a whole host of other things

3, Look at Webmaster tools, especially at the HTML improvement section, the crawl errors and then I’d use the robots.txt tester to refine my robots.txt file, so that google find the pages I want to serve and not what it thinks is the best.

4, Like Ruda suggested use the remove URLs tool on Webmaster tools to speed this up.

5, Build links to the page you want to get index / higher in SERPs