It would be best if you had your valid passport, bank statements of the last six months, and good photographs at least 2. These all should be scanned. Documents should be scanned by only the visa process system and are eligible; if any of them are left, the user should get checked. After the documents are checked, they have a special mark on each paper with a stamp showing that the scanning process is completed.
You should have a return ticket for yourself if someone else is going along with you. Both people should have your return ticket according to your visa expiration; if they return after your Visa expires, you are not eligible. You have to pay extra fees for visa updates according to the nation in which you're residing and your visa type.
People suffering from any health issue should have a proper doctor's prescription in which they are ready to travel in between their medication. All the eligibility conditions are necessary to follow if the people who are medically unfit or not are recommended not to journey. If it is an emergency to do much traveling, they should have the proper prescription from the doctor.