Much of the information that you will need about studying at university in the UK can be found on the UCAS website. You can explore the large range of courses and universities available.
Uniguide
The Uniguide website is also a very good source of information.
Russell Group
The Russell Group of the top research universities in the UK publishes information on subject choices which can be found on their website.
Studential
Extra information can be found on the studential website.