Help: What Do I Need 4 Uk Student Visa?

congrats for the admission! But what kind of admission letter did you receive, i mean, for what level of education is it?
however, i want you to be aware that admission does not guarantee you a visa, so you must realise and acknowledge that this is the time for the real thing that determines whether you get the visa or not.
for you not to be disappointed, these are the basic factors that you need to prove yourself to satisfy the ECO:
   1) The admission letter (preferably giving your accommodation details) with contacts details for correspondence with the school,
   2) Satisfying Bank Statements showing your (or your sponsor's) transaction details for the last six months,
    Note: Though you'd be issued a student working visa, but yet the embassy would want to be satisfied that you're not going to be a problem or resort to the public fund once in the UK.
   3) (in some cases) Evidence of your travel arrangements-you may book a flight ticket without paying the price-
   4) Evidence of social ties and of reference in Nigeria-perhaps your parents or guardians-The embassy needs their consents-
   5) The rest are up to the impression you give during your interview.
   Goodluck!