Assuming you're going to do a 5 year course as an English school leaver...
Year 1 - 4: SFE give you a tuition fee loan, and a maintenance loan (+/- maintenance grant)
Year 5 (+/- 6): SFE give you half the basic maintenance loan, the NHS pay your tuition fees and give you a maintenance bursary.
So for year 1, you just need to apply to Student Finance. Towards the end of your fourth year, you need to apply for both SFE and NHS funding, and expect both of them to screw up immensely on multiple occasions before you see a penny.