Help with computer networking

Hi Am Thomas and recently, I built a network for a small company with ten(10) to fifteen(15) computers. I used unmanaged d-link switche to acomplish that. Now the company is growing and it now have at least 100 devices we need to connect to it, we also need a firewall and we thought of pfsence. We want to implement both wired and wireless network with enough security. The question Am asking is: 1. Do we need a managed switch? 2. will pfsence be able to handle all the trafic and security? 3. Do we need to get outdoor omni antenna with at least 1.5km coverage

I need recomdations thank you

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