The information that you've provided here will be sent to our Customer Support Team to help you set up Twilio in your Salesable account. You can find your Twilio account SID and Auth Token in your Twilio Account Dashboard, under Project Info. Check out the support documentation provided right at the bottom of this form for more info.
Support Documentation from Twilio
How to find your Account SID and Auth Token: https://support.twilio.com/hc/en-us/articles/223136027-Auth-Tokens-and-How-to-Change-Them
How to purchase a phone number from Twilio: https://support.twilio.com/hc/en-us/articles/223135247-How-to-Search-for-and-Buy-a-Twilio-Phone-Number-from-Console