The steps would be more along the lines of this:
1. Sign up for hosting (NB: by signing up via our website, you could be eligible for a discount off your theme purchase.
More information here). It is on your host account that you will install WordPress.
2. Purchase the relevant theme, in this case, Vantage (If you have signed up for the hosting discount as above, hold off on the purchase until you have applied for the promo coupon).
If it helps, you may also wish to note the documentation we have for installing WordPress and Vantage
here so you have an idea of what is involved. In the case of the WordPress installation, if you sign up to a host which has a one-click installation for WordPress, such as BlueHost, it will save yourself some of that process as well. Thanks.