You will apply for 60 days Single Entry Tourist Visa that you can extend when you are in Thailand, yielding a total of 90 days to stay. For the return flight, you just stay 1 week so you need no visa at all (30 days exemption)
not advisable unless you are looking for a travel insurance. If you need a plan for a long stay in the kingdom it's still better to have someone you can talk face to face. Or you can opt for the ultimate solution, marry an insurance agent 😀