It is important to know whether you have a driver's license from your country, whether it is in English, and if you also hold an international driver's license. You will also need a residency certificate and a document from a doctor. You will have to visit all the necessary offices and go to the Transportation Office, where you can apply for a driver's license. Alternatively, you can use an agent to obtain it relatively effortlessly. I can recommend the agency M-Thai Visa, M Thai Visa with which I have had very good experience.
If you mean marriage visa, if your documents are complete, you will not be rejected. But I think you may need to do dtv visa or not. But if you are worried about doing it, I recommend you through the agency. You can try to contact them. M Thai Visa
You need to apply for ED visa. You should consult an expert. I have an agency that I recommend. They do both ED visa and DTV visa. You can contact them.