Need help with my AI voice agent please! (can pay 💸)

Hey all, I'm building my first AI voice agent using ElevenLabs and n8n so i can sell it to local businesses in my area, the businesses in my area are extremely underserved and most dont use AI at all.

here's how it works:

user calls the ElevenLabs voice agent, they have a normal conversation
if the user inquires about any specific information about the business, the agent calls the n8n webhook and activates the workflow shown below, that includes and AI agent with the ability to read the business data from a google sheets tool, book/cancel/reschedule/ check appointments when needed
then the n8n responds to the 11Labs agent

i have a couple of questions that i need answered from experienced users here:

do i even need n8n in this case? or should i only use ElevenLabs?
am i using the right tools?
do i need to use RAG with vectors or is searching in a google sheets enough?
how do i eventually sell it to a business exactly? which phone number should be used and how can they migrate from their system to my system, maybe they write their appointments on paper?
can customers message the voice agent in a WhatsApp message? not only a phone call?

I am also open to anyone who is willing to help me build this project as quickly as possible... I can pay 50$ if someone actually builds it or has built something similar, more interesting earlier.

feel free to comment or DM me.

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Need help with my AI voice agent please! (can pay 💸)