Do I need to include my middle name on the DTV visa application for Thailand, and how should I handle income requirements as an independent contractor?

When applying for the DTV online it asks for my first name and last name. From traveling in the past, I understand that for some countries you need to put both your first and middle name in the first name space. I’m trying to figure out if I need to do that for this visa application. Also if I do put my first and middle name in the first name space, it doesn’t allow me to put a space in between the names. Will this be an issue?

I’m hoping to hear from somebody who has already been granted the visa, who has a first and middle name, and applyed with a United States passport. What did you do and were there any issues?

Also, do they require a specific amount of income each month to grant you the visa or is it just a lump sum you need in savings?

I work as an independent contractor. I’d also appreciate any advice on how to apply when I both have my own buisness and also work for outside companies?

Thanks!