There are things that needs to be learned. Specially in the traditional advertising industry. I can give you more inputs and advices if you are pushing forward.

It would be amazing if this was hacked together overnight. Could work, given that there are startups that sell ambience based on music.

Interesting product, the platform does great things, target audience is probably more advertisers than agencies.

Quite technically involved. Could be very hard to replicate smells. And people don't engage with advertising signs. Need a huge capital investment to go live.