What Do I Do with my Very Badly Decayed Teeth?

The issues that you are describing ( big cavities and missing teeth) are very serious and should be looked at by a dentist as soon as you can. Have you been told that you have bone loss?  Are your remaining teeth loose?  It sounds as though your case will be extensive and may require a combination of  dental implants, dentures, or dental crowns.  Be prepared for a costly treatment plan that may require quite a few visits.  Please see a dentist soon to avoid possible toothaches or serious infections! Good luck.

Based on your description, and taking in consideration there are no photos or X-rays,probably the best option would be removing all those teeth and getting Mini Implant Dentures (Mini implant supported Dentures), It is cost effective and you will have a new smile in just one week.

Ron, thank you for your question and sorry to hear that you have so much problems with your teeth.I think the best thing would be is to find a dentist you trust. He/she would be able to examine you and give you the best possible solution for you. We can speculate here on the options, but without a through examination it will be just that: a speculation.All the best!