Talk to Dentist on Tooth Absecess

I got a cavity on my teeth the teeth it self broke and i think some of the root or teeth is still there and some of the infection is there what should i do and want to know the medication or treatment that can be used and how much max it cost now i am feeling like blood is coming sometimes please do tell me know about the treatment and the average cost of the treatment that would be helpful for me aswell and what are the main symptoms of infection if i have what are the symptom i have tell me please tell me and how severe this can be just tell me