Business structure before meeting with Brokers/Sellers?

Do most people have a business (LLC) and website established before connecting with brokers and sellers? Initially, I was able to engage with brokers without having an established business set up, but now it seems it's nearly required to engage, including have proof of funds before an initial conversation?

Any guidance on how to navigate these types of obstacles? If establishing a business and website is needed, any sources for how to do so would be greatly appreciated.

Thanks