Kaku

Hi, I'm a full-time research student receiving a bursary, but have several occasional short-term jobs here and there. One of them was self-employed and I earned a total of GBP 1,250; the other occasional jobs brought me varying amounts of money each month. I wanted to register for self-assessment, but do not have a business account. What do I need to do? Do I need to do self-assessment at all? If so, what type and what are the next steps?