Watch the video below on how to set up your Apple Developer Account
The link you require to set your AppleID up is - https://appleid.apple.com/
The link you require to go through the developer setup process is https://developer.apple.com/
Note: If you are using an existing Apple ID, then head straight to https://developer.apple.com/ and skip forward to 2 minutes on the video.
Once you've finalized the purchase wait for an email to come through from Apple welcoming you to the developer program, once this comes through your account is ready to use.