We can generate your Microsoft account on our side and provide you the login information after provisioning your account.
This is a business account with .onmicrosoft.com domain extension. (work or school account in Microsoft term)
However, if you prefer to go through the signup process, there isn't a direct method to create a Microsoft tenant without signing up or starting a trial subscription.
You can try the following steps if you prefer to control the whole process yourself.
Signup for any of the business plans at https://signup.microsoft.com or click following link
https://go.microsoft.com/fwlink/p/?LinkID=510933&clcid=0x409&culture=en-us&country=us
Create your sign-in with a username@companyname.onmicrosoft.com and click next till the payment information portion.
Cancel the portion requesting for credit card info, go directly to https://login.microsoftonline.com
