Purchasing a subscription is simple! First use the button in game to open the subscription window. Here you will be shown a complete list of the bonuses available and exactly what you will get depending on which of the two packages you decide to buy as well as the price.
Follow the instructions in this window and enter your payment details to purchase either of the subscriptions. Each player can have all available subscriptions active at the same time but they are not available as a bundle, you need to purchase each of them as separate purchases.
Once you start the subscription you will be charged and the bonuses become active. After a month you will be charged again unless you have cancelled the subscription. It is an automated payment but you can change your method of payment by canceling and re-subscribing again with a different payment method.