Which document should i prepare for DTV application based on medical treatment?

Im currently under treatment at a major hospital after an accident last year.

Will the recites for the treatments i have received the last 10 months be enough?

Im currently awaiting between treatments and dont have more than a verbal agreement to return to treatment when conditions are right.

Im retired an have pension every month.

Im getting a financial guarantee 500k from my family to support the application

All information on how i should prepare, and where to go and apply for smooth experience will be received with gratitude

Thanks in advance :)