I busted my lip yesterday and it has swelled a lot. just wondering what i need to do to fix it.

Lip injury: Since the swelling is "a lot" , please see a physician to make sure there is no infection or laceration that needs treatment. In the meantime, prefer a soft diet, mouth rinses after eating, avoid irritant foods. Take ibuprofen.

Keep clean and moist: So much depends on how you split your lip and what you did right afterward. Images would be helpful. If the split doesn't cut through the border between the lip and surrounding skin and doesn't involve other injuries to teeth then just keeping it clean and moist is all the treatment that's required.