What documents should I submit for my DTV visa application if I work as a freelancer?

I just received an email for requested documents for my DTV application, but I don't know what to submit. Even tho I submitted most of supported documents in the original application.

Here is the list of requested documents:

1. A copy of the company's registration/business license along with GST registration

I do not have a registered business. I work as a freelancer with independant monthly contracts. What documents should I submit here? Can I submit my client's LLC? What else should I submit to support my case?

2. Flight details and Hotel accommodation

I had submitted the flight number (no tickets) & agoda hotel bookings. Do I need to book a flight now and submit the ticket itself?

My hotel bookings were booked on 'pay later/free cancellation' option. And they have expired, do i need to rebook or should i just submit the pdf that was submitted in the original application?

3. A foreign employment contract or employment certificate

I do not have a employee certificate, although I do have a few client's contracts. I was also advised to add a letter head and stamp of your name at the top of the contract. What do you suggest?

4. Copies of all pages of the passport

I can submit these.

PS. I am applying at the Mumbai's thai consular in India. From other's experience, they tend to look for strong proof of regular employment and if one can sustain themselves in thailand.

I am very grateful for this group and the people in this community helping each other out . Thank you so much to everybody! All respectful opinions are appreciated!