Hi,
As per your condition, you are facing severe gums' problem.
Next Steps
First get a dental consultation done to priorities your treatment. Teeth cleaning (and polishing) is the first thing to be done. Also the dentist will recommend Gum Massage Liquid to help gums' healing. Maintain oral hygiene as more as possible by using floss/interdental brushes.
Health Tips
Please consult a Periodontist(Gums' specialist) for further advanced treatment.