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So say you have just 1 location, 2 staff, and 1 service and you're webflow as defined in Setup→Scheduler "Scheduler→General Setup" is "Location→Staff→Service". When a client clicks "Next" from your welcome page it will automatically pass them through the "Location" page and just present them with the "Staff" page that has two options. As soon as they pick the Staff, they'll be quickly bypassed through the "Service" page since there's only one option there and presented with the Time page where they'll select an appointment date and time.
If you like the sound of this option, you can turn it on under Setup→Scheduler "Scheduler→General Setup" and selecting the Auto Advance checkbox underneath the webflow:
Remember to press "Save" at the bottom of the scheduler setup screen to commit the changes.