Resale number for wholesale

[Viola24]

Hi,

Some wholesaler needs Resale number. I am outside of US. I have Pte Ltd overseas.

1) How can I obtain resale number?
2) What kind of info do I need to submit to US govt for any taxation matter?
3) any cost to maintain resale number? e.g. service provider like accountant, etc.

Thanks for your guidance.