We do not expect you to have had any contact with your beginner language before you arrive at university. However, you may find some language-learning apps useful when deciding on a beginner language in the first instance.
At first, you might find that some of your classmates have a bit more experience in your beginner language, like a GCSE. However, do not be discouraged, as this difference does even itself out after a few weeks. You will start to notice a difference in your ability very quickly, as you will be working in an exciting, fast-paced environment. Enjoy the challenge - but if it becomes too much of a challenge, remember you can always drop your beginner language if you find it is not for you.