Scared what do I do ?

So I accidentally burnt myself and the scab became black I got in the shower & then the scab fell off . Now it’s turning green because I applied coconut oil on it .. I just read on google not to do that . I’m scared because I can see it developing an infection and my arm is pretty sore I’m guessing it’s from it . What can I do to get rid of the infection I don’t have any bandages or anything & no money to purchase rn .. so someone help me out .