Hi, I have applied tourist visa online n got the email to provide additional document to proceed further : 
1, address for my stay 60 days in thai — originally I showed the first hotel that I stayed few days as I want to find hotels after landed;  should I really need to book 60 days hotel to attach such documents 
2, invitation letter from thai people (how to get this or what the content)
If I didn’t attach such additional document, will my record of failed tourist visa to be showed n affect my entry when landed in thai ?  I plan to apply Retire visa in thai after landed in fact.  Thanks for add advice!
TLDR : Answer Summary
The user has applied for a tourist visa to Thailand online and received a request for additional documents, including proof of accommodation for 60 days and an invitation letter from a Thai resident. They are uncertain if they need to book a hotel for the entire duration or can provide an alternative arrangement. They also express concern about the impact of a potentially unsuccessful tourist visa application on their future travel plans, particularly in relation to a planned retirement visa after arrival. Community members suggest booking a hotel with free cancellation and raising questions about why the user is opting for a tourist visa rather than directly applying for a retirement visa.
NON-O RETIREMENT VISA RESOURCES / SERVICES
- Go to the Retirement Visa Section for information on requirements, including age restrictions, financial requirements, and necessary documentation.
 - For immediate assistance, contact Thai Visa Centre directly via LINE at @ThaiVisaCentre or Email them.
 - Explore recent discussions by using the Non-O Retirement Visa tag in the search box at the top of the page.
 - Join the Thai Visa Advice Facebook Group to ask your questions, and get advice from others.